You try to move a heavy crate by throwing a lump of clay of mass m at it, with s

Question

You try to move a heavy crate by throwing a lump of clay of mass m at it, with speed v. The clay sticks to the crate upon impact. The crate is just on the verge of sliding during the collision, but static friction is large enough to keep it at rest. The crate will move if you : (a) Throw a perfectly bouncy ball with mass 0.6m at speed v (b) Throw a perfectly bouncy ball with mass 0.5m at speed v (c) Throw another sticky clay ball with mass 2m and speed 0.5v (d) Throw another sticky clay ball with mass 0.5m and speed 2v (e) Keep throwing the same type of sticky clay at the crate, at a rate of 1 per second.

Explanation / Answer

b) Throw a perfectly bouncy ball with mass 0.5m at speed v

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