Question

Please Solve Above three questions

Answer 1

4) no work is done by her as there is no displacement.

5) potential energy is the energy possessed by an object in rest on a height.

let distance be h

let mass be m

acceleration due to gravity be g

so potential energy = Fs = m*G*h

potential energy =mgh

6) power = work/ time

50 kg= 50*1000 g =50000g

work done= 10*50000*5=2500000

time =5 sec

2500000/5

500000 J or 500 kJ