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प्रश्न
A force is applied on a body of mass 20 kg moving with a velocity of 40 ms−1. The body attains a velocity of 50 ms−1 in 2 seconds. Calculate the work done by the body.
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उत्तर
Work done, W =`1/2` m (v22 − v12)
=`1/2xx20(50^2-40^2)`
= 9000 J
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संबंधित प्रश्न
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A sailboat is moving due to wind energy.
A force acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of the force. What should be the value of θ to get the maximum positive work?
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(i) A man pushing a wall.
(ii) a coolie standing with a load of 12 kgf on his head.
(iii) A boy climbing up a staircase.
How much work is done when a body of mass m is raised to a height h above the ground?
What is the condition for a force to do work on a body?
What happens to the work done when the dispacement of body is at right angles to the direction of force acting on it? Explain your answer.
What is work?
