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A 2kg body is allowed to roll down an inclined plane 4m long with angle of inclination 30 degree. calculate the work done. Take g as 10m/s square
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Answer :

Answer:

Explanation:

We will assume there is no Kinetic energy when the body reaches the bottom of the ramp (since this info was not given)

 Then the work will be equal to the negative  change in Potential Energy (mgh)

m = 2 kg    g = 10 m/s^2     h = 4 sin30  =2 m

mgh = 2 x 10 x 2 = 40 Joules of work

                 the change in potential energy is  

                      -40 J ....then the work is  - -40 = + 40 J

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