1) A ball is thrown from the top of a roof at an angle of 20 owith respect to the vertical. 1 s later a ball is dropped from thetop of the roof
a) If the height of the roof is 20 m, determine the velocitywith which the first ball must be thrown in
order for both balls to land at exactly the same time.
b) Imagine the velocity of the first ball is now known, andinstead it is the height of the building which
is unknown. Can you obtain an equation for the height of thebuilding which would result in both balls
landing on the floor at the same time
