Bob (88 kg) jumps out of a plane, starting at rest. After falling for 1 km, he is moving downward at 96 m/s. How much work is done by friction over this distance? You may assume that the only forces are gravity and friction.

The work done by friction is 456 kJ.

Explanation:

Given that,

Mass of Bob, m = 88 kg

After falling for 1 km, he is moving downward at 96 m/s. It is required to find the work done by friction over this distance. It can be calculated using work energy theorem as :

So, the work done by friction is 456 kJ. Hence, this is the required solution.                                      

part 1: which substance has a higher solubility?

a

smallest amount left undissolved atall temps in table shown most has dissolved high sol'by