Question

Using energy considerations and assuming negligible air resistance, show that a rock thrown from a bridge 20.0 m above water with an initial speed of 15.0 m/s strikes the water with a speed of 24.8 m/s independent of the direction thrown. (Hint: show that Ki + Ui = Kf + Uf)

Answer 1

The initial energy and final energy are the same

= 307.52m

≅ 308m

Answer 2

The initial energy and final energy are the same

= 307.52m

≅ 308m

Step-by-step explanation:

see the attached file