If you push with a power of 20 Watts on a 150 Newton object, how long would
it take to push it over the 4.3 m?

32.25 s

Explanation:

From the question,

P = W/t Equation 1

Where P = Power, W = work done, t = time.

But

W = F×d Equation 2

Where F = force and d = distance

Substitute equation 2 into equation 1

P = F×d/t Equation 3

make t the subject of euqation 3

t = (F×d)/P Equation 4

Givn: F = 150 N, d = 4.3 m, P = 20 watts.

Substitute these values into equation 4

t = (150×4.3)/20

t = 32.25 s

explanation:

newton's third law, for every action there is an equal and opposite reaction.