6. a boy lifts the load of 50 kg from the ground to a height of 6 m within a time of 10 minutes. Calculate the work done by the boy .(assuming g=10m/s²)
7. Calculate the mechanical power consumed in lifting the load in question 6
6. Work done = Force x Distance
Force = Mass x Acceleration due to gravity = 50 kg x 10 m/s² = 500 N
Distance = Height lifted = 6 m
Work done = 500 N x 6 m = 3000 J
7. Power = Work done / Time taken
Time taken = 10 minutes = 600 seconds
Power = 3000 J / 600 s = 5 W
Therefore, the boy did 3000 J of work and consumed a mechanical power of 5 W while lifting the load.