Question

1. An 80kg person dives off of a 20m high cliff with an upwards velocity of 15 m/s into the water below. Neglect air resistance.

a) How much potential energy does he have when he first jumps off the cliff?  *

b) How much kinetic energy does he have when he first jumps off the cliff? *

c) We can neglect the potential energy the diver has when he is just about the hit the water. Using the conservation of mechanical energy, how much kinetic energy would he have at that point? *

d) How fast is the diver going at?

e) How would the diver’s motion differ if he has 100kg instead of 80kg?  *

Answer 1