Q.

A person brings a mass of 2kg  from A to B . The increase in kinetic energy of the mass is 4 and the work done by the person on the mass is −10J , then VA−VB= _______ Where VA  and VB  are gravitational potentials at A and B.

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answer is 7.

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Detailed Solution

WA→B+WPerson=4 WAB−10=4WAB=14J             m[VA−VB]=14 2[VA−VB]=14∴VA−VB=7     joule/kg
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A person brings a mass of 2kg  from A to B . The increase in kinetic energy of the mass is 4 and the work done by the person on the mass is −10J , then VA−VB= _______ Where VA  and VB  are gravitational potentials at A and B.