A ball with a mass of 1.9 kg is dropped from rest and it falls down with a parac

Question

A ball with a mass of 1.9 kg is dropped from rest and it falls down with a parachute strapped to it. If air resistance is included, the parachute will slow down the ball and the ball will land at a lesser than speed than without air resistance. If the ball is dropped from a height of 61.7 meters above the ground and hits the ground with a speed of 21.2 m/s, how much work is done by non-conservative forces (air resistance) as the ball falls to the ground? Answer in Joules.

A ball with a mass of 1.9 kg is dropped from rest and it falls down with a parachute strapped to it. If air resistance is included, the parachute will slow down the ball and the ball will land at a lesser than speed than without air resistance. If the ball is dropped from a height of 61.7 meters above the ground and hits the ground with a speed of 21.2 m/s, how much work is done by non-conservative forces (air resistance) as the ball falls to the ground? Answer in Joules.

5,338.59

-723.06 ± 10%

Explanation / Answer

KE = 1.9*1/2*21.2^2 =426.968

PE change =1.9*9.8*61.7 = 1148.854

lost energy =work done by non conservative force = 1148.854 -426.968 => 721.886 J

take -ve sign since negative work is done

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