A 5kg rock is lifted 2m. Find the amount of work done.

The amount of work done on the rock is equal to 98 Nm.

Given the following data:

To determine the amount of work done:

First of all, we would calculate the force acting on the rock:

Force = 49 Newton

Now, we can determine the amount of work done:

Work done = 98 Nm

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98J

Explanation:

Given parameters:

Mass of rock  = 5kg

Height = 2m

Unknown:

Work done  = ?

Solution:

The amount of work done is given as:

 Work done  = Force x distance

 Work done = Weight x height

  Work done  = mgH

Now insert the parameters and solve;

 Work done  = 5 x 9.8 x 2 = 98J

fgravity=10x10=100n case 1

fgravity=30x20=600n case 2

6 times more

no. dot product   =0 when vecs at right angles