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.

500 m s^{- 1}

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5 c m s^{- 1}

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5 m s^{- 1}

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12.5 m s^{- 1}

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Solution

The correct option is C $5 m s^{- 1}$
Retardation is $25 c m / s^{2}$ , therefore, Acceleration, $a = - 0.25 m / s^{2}$
$t = 20 s, v = 0$
Putting the values in $v = u + a t$
$0 = u + (- 0.25) (20)$
$u = 5 m / s$

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Similar questions

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:(i) the initial velocity of bus,and (ii) the distance travelled by bus during this time.

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

The correct option is C 5ms−1Retardation is 25cm/s2, therefore, Acceleration, a=−0.25m/s2t=20s,v=0Putting the values in v=u+at0=u+(−0.25)(20)u=5m/s

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 C $5 m s^{- 1}$
Retardation is $25 c m / s^{2}$ , therefore, Acceleration, $a = - 0.25 m / s^{2}$
$t = 20 s, v = 0$
Putting the values in $v = u + a t$
$0 = u + (- 0.25) (20)$
$u = 5 m / s$