- #1

tubworld

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A force F = (2x i + 6y j) N acts on an object as it moves in the x direction from the origin to x = 5 m. Find the work W = Fdr done on the object by the force.

I felt that the answer shld be 2x * 5 = 10 but it's too simple to be true is it?

One more question:

A mass (m = 3 * 10^-5 kg) drops vertically at constant speed under the influence of gravity and air resistance.

(a) After the drop has fallen h metres, what is the work done by gravity?

(b) what is the work done by the air resistance?

The ans shld be mgh for part A and -mgh for part b right? cos both are in opposite direction?