Projectile motion

Question

Bob threw a water balloon upward at a velocity of 10 m/s while standing on the roof of a building that was 12 m high. What was the height of the balloon after 2 seconds?

Answer 1

h(2) = -4.9(2)^2 + 10(2) + 12 = -4.9(4) + 20+12

= 32 - 19.6 = 12.4 meters high after 2 seconds