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9th CBSE
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A lorry and a car moving with the same K E are brought to rest by applying the same retarding force, then;

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Important Questions on Work and Energy

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9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>Challengers*>Q 8

The figure shows the variation of force and displacement. Find the value of work done at the end of the displacement 30 m is 

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9th CBSE
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All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>Challengers*>Q 9
Water falls from a height of 60 m at the rate of 15 kg to operate a turbine. The losses due to frictional forces are 10 % of energy. How much power is generated by the turbine? (take,g=10m/s2)
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9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>Challengers*>Q 10
A block mass of 10 kg is dropped from a height of 10 m from the earth's surface and it falls onto a vertical helical spring of stiffness 5000 N/M and length 50 cm. The compression of the spring is (Take g=10 m/s2)