A bullet fired vertically upward from a gun held 2.0 m above the ground reaches its maximum height in 4.0s. calculate its initial velocity.
[g = 10ms-2]
- 10 ms-1
- 8 ms-1
-
40 ms-1
- 20 ms-1
The correct answer is: C
Explanation
At maximum height, the final velocity, v = 0
thus from v = u - gt
0 = u - gt
∴ U = at = 10 x 4 = 40 mls
There is an explanation video available .