A crane can lift up `10,000 kg` of coal in `1` hour form a mine of `180 m` depth. If the
Channel: Doubtnut
Date: 2020-02-20

A crane can lift up `10,000 kg` of coal in `1` hour form a mine of `180 m` depth. If the efficiency of the crane is `80 %`, its input power must be `(g = 10 ms^(-2))`.