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The Equations of Motion

a body is mov...

Question

a body is moving with a velocity of 15m/s and it comes to rest in 20m/s, what was the acceleration

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Solution

v2 - u2 = 2aS

S = 20m
v= 0 m/s
u = 15 m/s

(0)^2 - (15)^2 = 2 a 20

-225/40 = a

a = -5.625 m/s2

answer is negative since retardation is happening here

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