Ball A is dropped from rest from a bridge m above a river

PHYSICS · Subjective · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

Ball A is dropped from rest from a bridge

45\,

m above a river. Two seconds later, ball B is thrown vertically downward from the same point with an initial speed

u

so that both balls hit the water surface simultaneously. Taking

g = 10\,\text{m/s}^2

, determine the value of

u