What is the maximum distance that a 60.-watt motor may vertically lift a 90.-newton? weight in 7.5 seconds? a. 2.3mb. 5.0mc. 140md. 1100m

b. 5.0 m

Explanation:

Power: Power can be defined as the rate at which work is done.

The S. I unit of power is watt (W).

P = W/t ... Equation 1

Where p = power, W = work, t = time.

But

W = F*d ... Equation 2

Where F = force, d = maximum distance.

Substituting equation 2 into equation 1

P = F*d/t

making d the subject of the equation above,

d = Pt/F ... Equation 3

Given: F = 90 Newton, P = 60 watt, t = 7.5 seconds.

Substituting these values into equation 3,

d = 60*7.5/90

d = 5 m

Thus the maximum distance is = 5 m

The right option is b. 5.0 m