Match the Equation
Ben is waiting at a stoplight. When it finally turns green, Ben accelerated from rest at a rate of a 6.00 m/s2 for a time of 4.10 seconds. Determine the displacement of Ben's car during this time period.
x=vt+1/2at2
A world-class sprinter can burst out of the blocks and reach essentially top speed (of about 11.5 m/s) in the first 15.0 m of the race. What is the average acceleration of this sprinter?
4.41 m/s2
Can an object's average velocity equal zero when object's speed is greater than zero?
Yes, when the object moves in a straight line at a constant rate.
Jenna is approaching a stoplight moving with a velocity of +30.0 m/s. The light turns yellow, and Jenna applies the brakes and skids to a stop. If Jenna's acceleration is -8.00 m/s2, then determine the displacement of the car during the skidding process.
vf2=vi2+2ax
A car traveling at 22.4 m/s skids to a stop in 2.55 s. Determine the skidding distance of the car (assume uniform acceleration).
28.6 m
The acceleration vector of a particle in projectile motion
A. Points along the path of the particle.
B. Is directed horizontally.
C. Vanishes at the particle’s highest point.
D. Is directed down at all times.
E. Is zero.
D. Is directed down at all times.
A car begins at rest at a stoplight. After the light turn green, the car begins to accelerate 5 m/s2 over the span of 3.6 seconds. What is the car’s final velocity after this period of time?
vf=vi+at
A plane has a takeoff speed of 88.3 m/s and requires 1365 m to reach that speed. Determine the acceleration of the plane and the time required to reach this speed.
a=2.86 m/s2
t=30.9 s
A heavy red ball is released from rest 2.0 m above a flat, horizontal surface. At exactly the same instant, a yellow ball with the same mass is fired horizontally at 3.0 m/s. Which ball hits the ground first?
A. The red ball hits first.
B. The yellow ball hits first.
C. They hit at the same time.
A race car accelerates uniformly from 18.5 m/s to 46.1 m/s in 2.47 seconds. Determine the acceleration of the car and the distance traveled.
x=vit+1/2at2
An airplane lands with an initial velocity of 70.0 m/s and then accelerates opposite to the motion at 1.50 m/s2 for 40.0 s. What is its final velocity?
10 m/s
If an object is speeding up,
A. Its acceleration is positive.
B. Its acceleration is negative.
C. Its acceleration can be positive or negative depending on the direction of motion.
C. Its acceleration can be positive or negative depending on the direction of motion.