A bullet fired vertically upwards reaches a height of 500m. Neglecting air resistance, calculate the magnitude of the initial velocity of the bullet. [g = 10ms-2]
- 500.0ms-1
-
100.0ms-1
- 70.0ms-1
- 50.0ms-1
The correct answer is: B
Explanation
V2 = U2 + 2gsV2 = 0
V2 = 2gs
h = 500m
g = 10ms-2
V2 2 x 10 x 500
V2 = 10,000
V = \(\sqrt{10000}\)
V = 100ms-1