Per NCERT, what happens to the KE of a moving ball when a goalkeeper STOPS it (the ball comes to rest)?
AThe KE becomes infinite
BThe KE is unaffected
CThe KE doubles
DThe ball's KE decreases to zero — the work done by the goalkeeper (negative work on the ball) equals the change in KE per the work-energy theorem
Answer & Solution
Correct answer: D. The ball's KE decreases to zero — the work done by the goalkeeper (negative work on the ball) equals the change in KE per the work-energy theorem
Per NCERT, the work-energy theorem says the negative work done by the goalkeeper reduces the ball's KE to zero. The other options misstate.
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