A thief is running away on a straight road in jeep moving with a speed of 9 ms–1. A police man chases him on a motor cycle moving at a speed of 10 ms–1. If the instantaneous separation of the jeep from the motorcycle is 100 m, how long will it take for the police to catch the thief

(1) 1 s

(2) 19 s

(3) 90 s

(4) 100 s

Concept Videos :-

#45-Relative motion
#46-Relative motion-1
#47-Relative motion-2
#48-Relative motion-3
#49-Relative motion-4
#50-Relative motion-5

Concept Questions :-

Relative motion in 1-D

(4) The relative velocity of policeman w.r.t. thief = 10 – 9 = 1 m/s.

∴ Time taken by police to catch the thief $=\frac{100}{1}$=100 sec

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