A block of mass 10 kg slides with velocity of 10 m/s on a rough horizontal surfa

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.

Options:

A . 1N

B . 10N

C . 100N

D . 5N

Answer: Option B
:
B
u = 10m/s
v = 0
s = 50

v^{2}

u^{2}

= 2as
a = -1 m/

s^{2}

Friction from is providing this deceleration of the block

fr = ma
fr = 10

\times

1
fr = 10N
so friction is 10N in backward direction.

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