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 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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