Question

Aman is a student of class IX. He saw an old man trying to keep his 50 kg box on the roof
of a bus of height 5m but was unable to do so. Aman picked up his box and placed it on the
roof of the bus.
The old man thanked Aman.
(5)
Q2a) Which type of energy is possessed by the box at the top of the bus.
Q2b) From where does the energy come.
Q2c) Calculate the energy possessed by the box at the top of the box.
Q2d) The work done by the Aman is positive, negative or zero?
Q2e) Write the formula for mechanical energy​

Answer 1

a- potential energy
b- The energy comes due to height of the object
c- P.E= mgh (where m=mass , g= acceleration due to gravity , h = height )
50*10*5
=2500joules
d- the work done is negative as yhe angle between force and displacement is 180 degree
e- mgh