Stone rubbed on a rough floor and place on the skin show heating sensation.Explain a body of mass 2 kg is moving with a velocity of 8 m/s . How much work should be done to bring the body to rest?
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Answer:
Data: Mass=2 kg
Velocity=8 m/s
Work=?
Solution: Work=F. D
F=?
F=ma
F=2×9.8=19.6 N
D=?
a=v/t
T=v/a=2/9.8=0.2
V=d/t
D=vt=2×0.2=0.4
Work = 19.6×0.4=7.84 J
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The work done to bring the body at rest is equal to 16t/S
Explanation:
Given,
The mass of a body is equal to 2 kg.
The velocity at which the body is moving is equal to 8 metre per second.
let us consider the time in which the body comes to rest is equal to t and the distance it covers before coming to rest is equal to s
The work done by the body is equal to F•S
= 2x8/t x S
= 16t/S
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