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Q.

A lorry and a car moving with the same KE are brought to rest by applying the same retarding force. given that the mass of the lorry is more than the mass of the car, then


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a

Lorry will come to rest at a shorter distance.

b

Car will come to rest at a shorter distance.

c

Both come to rest at the same distance.

d

None of the above. 

answer is C.

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Detailed Solution

A lorry and a car moving with the same KE are brought to rest by applying the same retarding force, and then both come to rest at the same distance.
Since the Kinetic Energy of both the Lorry and car is the same, it would require an equal amount of work to bring both to rest as,
Work Done = Change in Kinetic Energy
and since work is given by,
W = Fs
Where W = work done
F = Force applied
s = Displacement
Since the force acting on both is the same, it would require the same amount of distance to bring them both to rest.
 
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