a. V^2 = Vo^2 + 2g*h = (-12)^2 + 19.6*40 = 928, V = 30.5 m/s.
b. Vo + g*t = 30.5. -12 + 9.8t = 30.5, t = 4.34 s. To reach gnd.
a person in a hot air balloon ascending vertically at a constant rate of 12m/s drops a rock over the side when the balloon is 40m above the ground, what is the velocity of the rock just before it hits the ground, how long will it take the rock to reach the ground
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