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Find the initial velocity of a car which is stopped in 10 seconds by applying brakes.

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Find the initial velocity of a car which is stopped in 10 seconds by applying brakes. The retardation due to brakes is 2.5 m/s2 .

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Initial velocity, u=?

Final velocity, v=0m/s (car is stopped)

Retardation, a=-2.5 m/s2

Time, t=10s

v=u + at

0=u +(-2.5)x 10

u=25m/s

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