The 2090 kg cable car shown in the figure descends a 200-m-highhill. In addition to its brakes, the cable car controls its speed by pulling a 1720 kg counterweight up the other side of the hill. The rolling friction of both the cable car and the counter weight are negligible.

(a) How much braking force does the cable car need to descend at constant speed?

(b) One day the brakes fail just as the cable car leaves the top on its downward journey. What is the runaway car's speed at the bottom of the hill?

Transcribed Image Text:

Counterweight 200 m 30° 20°