A `4 kg` block is on a smooth horizontal table. The block is connected to a second block of mass `1 kg` by a massless flexible taut cord that passes over a frictionless pulley. The `1 kg` block is `1m` above the floor. The two block are released from rest. With what speed does the `1 kg` block hit the ground?
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Answer

2

Explanation

Decreases in potential energy of 1 kg = increase in kinetic energy of both
`implies 1 xx 10 xx 1 = 1/2 xx(4 + 1) xx v^2 " ":." " v = 2 m//s`