First slide

Relative motion based problems

Question

A bus is moving with a speed of 10 m s ^-1 on a straight road. A scooterist wishes to overtake the bus in 100 s. If the bus is at a distance of I km from the scooterist, with what speed should the scooterist chase the bus :

Easy

A

10 m s^-1
B

20 m s^-1
C

40 m s^-1
D

25 m s^-1

Solution

1000 = (v - 10) (100) $\Rightarrow$ v = 20 m/s

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