Question

If a force does a positive amount of work on an object, does the object’s speed increase, decrease, or remain the same? Justify your answer.

Answer 1

see that there is no dependence on speed, so the work remains constant

Step-by-step explanation:

Work is defined by the expression

W = F. d

where the boldface indicates vectors, this equation can be written in scalar form

W = f d cos θ

where θ is the angle between force and displacement.

We see that there is no dependence on speed, so the work remains constant

The power is

P = W / t

P = f d / t

p = F v

we see that the power is the one that depends on the speed of the body