Multiple choice question IX — task. Science CBSE, Class 9.

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1. When a person lifts a body from the ground, work done by the lifting force is:

\(1\)
\(zero\)
\(+ve\)
\(-ve\)

2. When two bodies collide elastically, then:

KE of the system alone is conserved
only momentum is converted
both KE and momentum are conserved
neither KE nor momentum is conserved

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