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.

Step-by-step solution Step 1 of 1 The potential energy loss by the rock is The gain in the kinetic energy of the rock is According to the work energy theorem Or Therefore, Or Substitute for , for , and for in the above equation. Hence, the speed of the rock when it strikes the water is .