Motion
A man runs at a velocity of 4.5 m/s for 15.0 min. When going up an increasingly
steep hill, he slows down at a constant rate of 0.05 m/s2 for 90.0 s and comes to
a stop. How far did he run?
(4.5*15*60)+[0.5(0+4.5)90]
4.3103 m
A 45 kg rocket accelerates at 3 m/s2 What force are the engines providing?
135 N
What is the momentum of a 40 kg flaming burrito flying through the air at 8 m/s?
320 kgm/s
Joe is pushing with 50 N of force in order to hold a 6 kg bag of ice stationary over his head. How much work is he doing?
0 J
Light travels in a straight line at a constant speed of 300,000 km/s for 30 million meters. What is light’s acceleration?
0 m/s
How fast is a freshman falling if they fall from a 200 m roof top for 6 seconds?
58.8 m/s
You push a 6 kg box with a force of 20 N. What is the acceleration of the box if there is 2 N of friction?
3 m/s2
A 3 kg cat runs through a field of catnip with a momentum of 20 kgm/s. What is the cat's velocity?
6.67 m/s
What is the potential energy of a 70 kg freshman standing on the roof of a 30 m high building?
21,000 J
A 2 kg pumpkin is launched at 20 m/s and collides with a 20 kg scarecrow which is at rest. The collision breaks the head off of the body and sends both flying through the air. The pumpkin bounces back at a velocity of -5 m/s while scarecrow’s 15 kg body breaks off at a speed of 2 m/s. How fast is the separated head of the scarecrow moving?
4 m/s
A car is traveling down the road at 20 m/s when a suicidal squirrel run across the road. What is the acceleration of the car if it takes 5 seconds to come to a complete stop?
-4 m/s2
A 1,000 kg car is driving at 12 m/s when a suicidal squirrel runs in front of the car. What is the force the brakes apply to the car if it takes 2 seconds to come to a complete stop?
-6,000 N
Joe (mass = 10 kg) is sitting in a boat (mass = 200 kg) at the dock when he decides to get out. What is the velocity of the boat if he jumps out with a velocity of 20 m/s?
-1 m/s
A 1 kg flea is riding on the back of a 20 kg dog. The dog is running at 4 m/s. What is the kinetic energy of the flea and the dog?
168 J
An 80 kg physics teacher is standing on the edge of the roof to the gym which is 20 m high. He then jumps. At some point on the way down he has a gravitational potential energy of 12,000 J. What is his velocity at this point?
10 m/s
Joe is driving at 40 m/s for 35 min when he decides to speed up to pass you. During this time he travels 120 m for 2 seconds. What was his acceleration?
20 m/s2
Joe is pushing 100 kg car with a force of 200 N. You decide to help him and push with a force of 300 N in the same direction. What is the acceleration of the car if there is 100 N of friction?
4 m/s2
A rather large fish is about to eat an unsuspecting small fish. The big fish is swimming at 8m/s, while the small fish has a mass of 1 kg and is swimming at -4 m/s. What is the mass of the big fish if the velocity of the big fish is 6 m/s after lunch?
5 kg
A 45 kg freshman gets pushed off the a diving board which is 180 m high. How fast is he falling right before he hits the water?
60 m/s
An astronaut (m = 60 kg) is at rest and stranded from his spaceship which is 30 meters away. His only hope to get back is to hold his breath and throw his 20 kg air tank in the opposite direction at -9 m/s to send him back towards his ship. How long will it take him to make it back to his ship?
10 sec
A freshman throws a waterballoon straight down off a building at a velocity of 30 m/s. How far will the balloon fall after 8 seconds?
560 m
A 1,000 kg car is driving at 20 m/s and accelerates for 2 seconds covering a distance of 80 m. What force did the engine provide during this time?
20,000 N
Two identical balls of clay are moving towards each other. One has a velocity of 36 m/s and the other has a velocity of -10 m/s. What is the final speed of the balls if they collide inelastically?
13 m/s
A pink flamingo gets pushed from the top of a 245 m high cliff. If the flamingo doesn't fly, how fast will it be falling right before it hits the ground?
70 m/s
A 7 kg bike is riding along at 10 m/s when it then slows down to 6 m/s over 2 seconds. How much work was done during this time?
-224 J (or 224 J)