A bullet fired vertically upwards reaches a height of 500m. Neglecting air resistance, calculate the...

WAEC 2015

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

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Correct Answer: Option B

Explanation

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

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A bullet fired vertically upwards reaches a height of 500m. Neglecting air resistance, calculate the...

Correct Answer: Option B

Explanation

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