free fall


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free fall

1. A ball is thrown vertically upward. The rock rises to some maximum height and falls back. Which of these is (are) zero when the ball reached the maximum height ? (1) the speed of the ball (2) the velocity (3) the acceleration

1 only
2 only
1 and 2
1 and 3
1, 2, and 3

2. A brick is dropped from rest from a height of 4.9 m. How long it take the brick to reach the ground ?

0.6 s
1.0 s
1.2 s
1.4 s
2.0 s

3. What maximum height will be reached by a stone thrown straight up with an inial speed of 35 m/s ?

98 m
160m
41m
63m
18m

4. Agathe throws a ball vertically upward. The ball returns to the point of release after 3.5s. What is the speed of the ball as it is released?

0 m/s
14 m/s
17 m/s
21 m/s
34 m/s

5. A rock is dropped from a height h above the ground. It falls and hits the ground with a speed of 11 m/s. From what height should the rock be dropped so that i speed on hitting the ground is 22 m/s ?

1.4h
2.0h
3.0h
4.0h
0.71f

6. What maximym height will be reached by a stone thrown straight up with an initial speed of 35 m/s ?

98 m
160 m
41 m
63 m
18 m

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