Question

a boy throws a stone vertically up to a man standing at a height of 2.0m above the boy. If the stone is thrown up with a velocity of 7.0metres per second what is the velocity of the stone at the instant when it is caught by the man
A. 3.0m/s B. 6.2m/s C. 9.0m/s D. 9.4m/s

Answer 1

m g h = (1/2)m (7^2) - (1/2) m v^2
9.81 (4) = 49 - v^2
v^2 = about 9
v = about 3

Answer 2

Good