A bullet fired vertically from upward from a gu... - JAMB Physics 2009 Question
A bullet fired vertically from 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]
A
10 ms-1
B
8 ms-1
C
40 ms-1
D
20 ms-1
correct option: c
At maximum height, the final velocity, v = 0
thus from v = u + at
0 = u - at
∴ U = at = 10 x 4 = 40 mls
thus from v = u + at
0 = u - at
∴ U = at = 10 x 4 = 40 mls
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