A pile driver of mass 5 tonnes falls from a height of 10m onto a pile of mass 8 tonnes There is no rebound on impact as the pile is driven 20cm into the ground. Determine the common Velocity of hammer and pile after impact.​

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diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.

d

explanation:

v=uf/(u-f)

= 5.10/(5-10) convex lens has positive focal length

=50/-5

=-10 cm (formed at other side)