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The S.I. unit of energy is .............
The S.I. unit of work is
Find the kinetic energy of a body of mass 1 kg moving with a uniform velocity of 10 m s-1.
How much work is done when a body of mass m is raised to a height h above the ground?
A person of mass 50 kg climbs a tower of height 72 metres. Calculate the work done. (g = 9.8 m s−2).
How much work is done by the gravitational force of earth acting on a satellite moving around it in a circular path? Give reason for your answer.
A boy of mass m climbs up a staircase of vertical height h.
- What is the work done by the boy against the force of gravity?
- What would have been the work done if he uses a lift in climbing the same vertical height?
(i) A 200g ball is thrown vertically upward with an initial velocity of 30 ms-1. Draw a velocity-time graph for the motion of ball.
(ii) How long will the ball take to reach the highest point?
(iii) What will be the kinetic energy of ball, when it returns to the starting point, neglecting the air resistance?
(iv) What will be the potential energy of ball at highest point?
