Find the initial velocity of a car which is stopped in 10 seconds by applying brakes. Retardation due to brakes is 2.5 m/s $^{2}$ .

25m/s

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20m/s

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30m/s

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15m/s

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Solution

The correct option is D 25m/s
Retardation a =-2.5 m/s2, Initial velocity u = ?,
Final velocity, v = 0 m/s, Time t = 10 s
Using v = u + at, we have0 = u -2.5 m/s2 x 10 s
⇒ u = 25 m/s.

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A car is retarded by applying brakes at the rate of 2 m/ $s^{2}$ It is finally stopped in 10 s. Find its initial velocity.

3 s

5 m s^{- 2}

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