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Question

A block of mass 10 kg slides with velocity of 10 m/s on a rough horizontal surface. It comes to rest after covering a distance of 50 meters. Find the frictional force.


A

1N

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B

10N

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C

100N

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D

5N

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Solution

The correct option is B

10N


u = 10m/s

v = 0

s = 50

v2- u2 = 2as

a = -1 m/ s2

Friction from is providing this deceleration of the block

fr = ma

fr = 10 × 1

fr = 10N

so friction is 10N in backward direction.


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