A block of maas 4kg is moving on a rough surface with speed of 2m/s it comes to rest after 2sec. If same block is kept moving with a uniform velocity of 3m/s force that should be exerted on it is What?
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120 Newton’s I guess I’m not sure
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Answer:
option A --> 4N
Explanation:
Given the mass of the block = 4 kg
Velocity of the block v = 2 m s−1
The acceleration of the block
a =v/t = 2/2 = 1 m/s2
a = (v-u)/2 = (0-2)/2 = -1 m/s2
The retarding force is F = ma = 4 × (1) = 4 N
Force required to keep it in motion = ma = 4 N
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