The 200-kg steel hammerhead of a pile driver is lifted 3.00 m
above the top of a vertical I-beam being driven into the ground
(Fig. 6.12a). The hammerhead is then dropped, driving the
I-beam 7.4 cm deeper into the ground. The vertical guide rails
exert a constant 60-N friction force on the hammerhead. Use the
work–energy theorem to find (a) the speed of the hammerhead
just as it hits the I-beam and (b) the average force the hammerhead
exerts on the I-beam. Ignore the effects of the air.