Answer:
work done = 71.5 J
Explanation:
Given that,
Energy = Fifty eight J
Mass of box = 12.0 Kg
Speed = 1.5 m/s
U = work done
The external force acts solely on the box and also the earth system. conjointly note that the work done by external force
= modification of energy of the system
U = work done - K
Also recall that the box is moving with constant speed therefore, there will not be modification in acceleration, hence, there'll be no modification in K.E..
Therefore, K is adequate to zero.
K= 0
U = work done = energy
U = 58.0 J
work done by pushing force = K + U
work done = final K.E. - initial K.E. + U ........1
Initial K.E. = zero
Substitute the mandatory values into equation one
work done = 1/2m v² - zero + U
work done= 0.5 x 12.0 x 1.5² + 58.0
= 13.5+58.0
work done = 71.5 J
The world one by the pushing force is 71.5 J
