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Chilukuri Sai Kartik Grade: 12
        

A thief in stolen car crashes through a police checkpost at top speed of 90 kmph. A motorcycle cop, reacting after 2 sec, accelerates from rest at 5m/s2.His top spd is 108 kmph.


Find max. separation between theif and police?


a)112.5m b)115m c)116.5m d)None above


Also plz. explain me how to solve these kind of problems when we have to find separation, top speed etc.

7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points
										

Dear chilukuri


speed of the car = 90 kmph = 25 m/sec


let after t sec of police stated distance between  them are maximum


max speed of police =108 km/h = 30 m/sec


time taken by police to atttain a speed of 25 m/sec=25/5 =5 sec


distance between them will increse  till police man attain a speed og more than 25 m/sec


 distance travell be thief = 25*(5+2) =175 m


distance travell by police =1/2 *5* 5=62.5 m


so distance between them S=175 -62.5 =112.5








 


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Badiuddin

7 years ago
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