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Tushar Watts Grade: 12
        

ques) A thief in a stolen car through a police check post at his top speed of 90 km/h. A motorcycle , reacting after 2 sec, accelerates from rest at 5 m/s2. His top speed being 108 km/h. Find the max seperation between policeman and thief.


 

8 years ago

Answers : (2)

Prasanjeet Mohanty Mohanty
37 Points
										

After 2s the thief would be at a distance of 50m fromthe police car.We shall consider this to be t=0.


let after a time t the distance be max.


then the distance between the check post and the thief would be 50+25t.......(i)


the police car would be at a distance of 2.5t^2from the check post...........(ii)


 then the distance between them would be x=50+25t-2.5t^2


this would be max when dx/dt=0


which implies dx/dt=25-5t=0


therefore t=5s.hence x=50+125-62.5=112.5(ans)

8 years ago
Prasanjeet Mohanty Mohanty
37 Points
										

P.s I have converted the velocity from Km/h to m/s

8 years ago
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