Kinematics
A car starts from rest and accelerates at 3.0 m/s2 for 4 seconds. What is its final velocity?
12 m/s
A ball is launched at 20 m/s at 30o above the horizontal. Find its initial horizontal and vertical velocity components.
Vx= 17.3 m/s
Vy= 10 m/s
A 10 kg object accelerates at 3.0 m/s2. What is the net force acting on it?
30 N
A satellite moves in a circular orbit around a planet. What direction does the net centripetal force point?
Toward the planet's center
A car starts from rest and accelerates at 2.5 m/s2. How long does it take to travel 20m?
4.0 s
A ball rolls horizontally off a 45 meter-high cliff at 12 m/s. How long does it take to hit the ground, and how far from the cliff does it land?
3.03 s
36.4 m
A 15 kg box is pushed horizontally with a force of 80 N. It accelerates at 2.0 m/s2. Find the net force and the friction force acting on the box.
50 N
A 0.5 kg object moves at 4 m/s in a circle of radius 2 m. Find its centripetal acceleration.
8.0 m/s2
A train is moving at 5.0 m/s and accelerates at 1.5 m/s2 for 8 seconds. How far does it travel during this time?
88 m
A projectile is launched at 25 m/s at 37o above horizontal and lands at its original height. Find its total time in the air and horizontal range.
t= 3.07 s
x= 61.3 m
A 25 kg box is pushed horizontally with 100 N and accelerates at 2.0 m/s2. Find the coefficient of kinetic friction.
=0.204
A 0.5 kg object moves at 6 m/s in a circle of radius 2 m. Find the required net centripetal force.
9 N
A car moving at 24 m/s brakes uniformly and stops after traveling 48 m. Find its acceleration and the time it takes to stop.
-6.0 m/s2
4 s
A ball is launched at 20 m/s at 30o above horizontal. At what time does it reach a height of 5.0 m on its way up, and what is its speed at that moment?
0.876 s
17.4 m/s
A block slides down a 25o incline with a coefficient of kinetic friction of 0.15. Find its acceleration. Assume the incline is straight and the block stays in contact with it.
2.81 m/s2
A 0.7 kg toy plane moves in a horizontal circle at 8.5 m/s. The string exerts a horizontal inward force of 28.1 N. Find the circle's radius and the number of revolutions the plane makes in 20 s.
1.8 m
15 revolutions