Question

compute the power required by a man to move a 10 kg mass so as to change the speed of mass from 10 m/s to 20 m/s in 5 seconds

Answer 1

Given,
mass = 10 kg
initial speed = 10 m/s
final speed = 20 m/s

initial kinetic energy = 1/2 X 10 X (10)^2 = 500J
final kinetic energy = 1/2 X 10 X (20)^2 = 2000J

Change in energy = 1500J
Therefore, energy required = 1500J

Answer 2

Given,
mass = 10 kg
initial speed = 10 m/s
final speed = 20 m/s

initial kinetic energy = 1/2 X 10 X (10)^2 = 500J
final kinetic energy = 1/2 X 10 X (20)^2 = 2000J

Change in energy = 1500J
Therefore, energy required = 1500J