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Velocity-Time Graphs

Velocity-time...

Question

Velocity-time graph for a train is shown in figure. Find its retardation in the last $5 m i n$ :

A

200 m s^{- 2}

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B

200 m m i n^{- 2}

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C

100 m m i n^{- 2}

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D

None of these

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Solution

The correct option is B $200 m m i n^{- 2}$
Retardation in the last $5 m i n = -$ (slope of the line BC) $= - \frac{B E}{E C} = - \frac{(0 - 1000)}{(35 - 30)} = - \frac{- 1000}{5} = 200 m . {m i n}^{- 2}$

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