JAMB - Physics (2009 - No. 3)
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]
[g = 10ms-2]
10 ms-1
8 ms-1
40 ms-1
20 ms-1
설명
At maximum height, the final velocity, v = 0
thus from v = u - gt
0 = u - gt
∴ U = at = 10 x 4 = 40 mls
thus from v = u - gt
0 = u - gt
∴ U = at = 10 x 4 = 40 mls