Practice-4 on Speed, Velocity, and Acceleration

Question 1: A ball is projected upward. Eventually, after the ball reaches its maximum height, it will fall back.
Indicate which statement is correct.

speed never changes
At the highest point in its motion, the ball's velocity is zero.
At the highest point in its motion, the ball's velocity is not zero
none of the above

Question 2: Assume a student throws a ball vertically downward with a velocity of 10 m/s.
If air friction is considered negligable then calculate the speed of the ball one second later.

9.8 m/s
20 m/s
19.8 m/s
18.8 m/s

Question 3: Suppose you throw a ball vertically with a velocity of 10 m/s.
Approximately, when will it reach its highest height?

3 s.
2 s.
5 s.
1 s.

Question 4: Assume a television screen fall down from rest at a great height.
Calculate the speed after it has fallen for 5 seconds where air resistance is considered negligible.

49 m/s
48 m/s
47m/s
46m/s

Question 5: Assume a box of 5 kg is dropped from a building and hits the ground in 7 s.
Calculate the time it takes for a 10-kg box to hit the ground where air resistance is considered negligible.

14 s
10 s
5 s
7 s

Question 6: If a rocket is fired from a fighter jet and assuming that air resistance is negligible.
Which statement is correct about the rocket.

The rocket stops immediately.
Its speed doubles every second.
Its speed increases at 9.8 m/s.
none of the above.

Question 7: If you throw a ball up in the air.
Indicate the status of the ball when it reaches its highest point.

acceleration is zero.
speed doubles every second.
velocity is halved and the acceleration is downward.
velocity is zero and the acceleration is downward.
none of the above.

Question 8: If you throw a ball up in the air with an initial velocity of 20m/s.
Calculate the ball's velocity after 4 seconds.

− 19.2 m/s
0 m/s
19.2 m/s
20 m/s

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