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]
A
500.0ms-1
B
100.0ms-1
C
70.0ms-1
D
50.0ms-1
Verified Correct Answer: B.
Physical Principles & Numerical Solution
V2 = U2 + 2gs
V2 = 0
V2 = 2gs
h = 500m
g = 10ms-2
V2 2 x 10 x 500
V2 = 10,000
V = \(\sqrt{10000}\)
V = 100ms-1
Source: Myschool Past Questions Archive (Record #45442)