You drop a 2.3 kg textbook to a friend who stands on the ground 9 m below the textbook with outstretched hands 1.50 m above the ground.
What is the speed of the textbook when it reaches the hands?
physics - MathMate, Wednesday, October 21, 2009 at 12:03am
Ignoring air resistance, use conservation of energy.
mg(H-h) = (1/2)mv²
solve for v.