Question

a drop of mass 1.00g falling from a height 1.00km.It hits the ground with a speed of 50.0ms What is the work done by the unknown resistive force? ​

Answer 1

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Answer 2

Work done by unknown resistive force is -8.75 Joules.

Given - Mass, height and speed

Find - Work done

Solution - Work done by gravity and force will be equal to the kinetic energy of drop. Representing this in equation form -

mgh + W = 1/2mv²

Keep the values in formula

As we know, 1 kg = 1000 g

So, 1 g = 10-³ kg

Also, as we know, 1 km = 1000 m

10-³*10*1000 + W = 1/2*10-³*50²

10 + W = 1.25

W = 1.25 - 10

W = -8.75 Joules

Hence, the work done is -8.75 Joules.

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