Question

what equations do i use?

3. A 57kg trampoline artist jumps vertically upward from the top of a platform with a speed of 4.7m/s. How fast is he going as he lands on the trampoline 3.8m below?

4. A 124g baseball is dropped from a tree 11.6m above the ground. With what speed would it hit the ground if air resistance could be ignored?

Answer 1

3. vf^2=vi^2+2g*3.8 will do it

4. same formula. vf^2=vi^2+2ad

Answer 2

the correct answer was 15.08 m/s. how on earth do you get that?