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Find the parameters of a projectile motion.

1. A spherical Balloon is inflated at the rate of 144pie cubic inches per minute (in^3/min). How fast is the radius of the balloon changing when the radius is 4 inches? Recall the formula for volume of sphere: V (4/3) pieR^3?
2. A projectile is launched vertically upward with the initial velocity of 20 ft/sec from the top of a 50 foot building?
a. prepare an equation of H (t) that describes height of the projectile after t seconds?
b. When will the projectile hit the ground?
c. When does the projectile reach its highest height?
d. What is the greatest height?

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