Answer:
(1) 1500 J (2) 273.7 W
Explanation:
Given that,
The mass of a boulder, m = 25 kg
Distance moved by the force, d = 30 m
Applied force, F = 150 N
As a leftward force of friction that is two thirds the magnitude of the force, f = 100
Net force = 50 N
(1) Work done by the force is equal to the product of force and displacement i.e.
W = Fd
Put all the values,
W = 50 × 30
W = 1500 J
(2) It takes the boulder 5.48 seconds to travel 30 meters.
Power, P = W/t
So,
[tex]P=\dfrac{1500}{5.48}\\\\P=273.7\ W[/tex]
