When brakes are applied to a bus, the retardation produced is $25 c m s^{- 2}$ and the bus takes $20 s$ to stop. Calculate the initial velocity of the bus.

5 m s^{- 1}

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10 m s^{- 1}

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15 m s^{- 1}

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20 m s^{- 1}

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Solution

The correct option is A $5 m s^{- 1}$
Final Velocity, $v = 0$

Retardation, $a = 25 c m s^{- 2} = 0.25 m s^{- 2}$

Time, $t = 20 s$

Let, initial velocity $= u$
According to newton first law
$v = u - a t$
$0 = u - (0.25 \times 20)$
$u = 5 m s^{- 1}$

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When brakes are applied to a bus, the retardation produced is 25cms−2 and the bus takes 20s to stop. Calculate the initial velocity of the bus.

The correct option is A 5ms−1Final Velocity, v=0Retardation, a=25 cms−2=0.25 ms−2Time, t=20sLet, initial velocity =uAccording to newton first lawv=u−at0=u−(0.25×20)u=5 ms−1

When brakes are applied to a bus, the retardation produced is $25 c m s^{- 2}$ and the bus takes $20 s$ to stop. Calculate the initial velocity of the bus.

The correct option is A $5 m s^{- 1}$
Final Velocity, $v = 0$

Retardation, $a = 25 c m s^{- 2} = 0.25 m s^{- 2}$

Time, $t = 20 s$

Let, initial velocity $= u$
According to newton first law
$v = u - a t$
$0 = u - (0.25 \times 20)$
$u = 5 m s^{- 1}$