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The Equations of Motion

A body is mov...

Question

A body is moving vertically upwards.Its velocity changes at a constant rate from $50 m s^{- 1}$ to $20 m s^{- 1}$ in 3s.What is its acceleration?

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Solution

Given
initial velocity(u) = $50 m s^{- 1}$
final velocity = $20 m s^{- 1}$
time = 3 seconds

applying $v = u + a t$

$20 = 50 + a t$

$- 30 = 3 a$
acceleration, $a = - 10 m s^{- 2}$

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The Equations of Motion

Standard IX Physics

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