The air in a windstorm moves at a speed of 30 m/s. When it hits a stop sign, the air stops momentarily. The mass of air hitting the stop sign each second is about 2.0 kg. Make a list of physical quantities you can determine using this information and determine three of them.
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Rachel is on the roof of a building, h meters above ground. She throws a heavy ball into the air with a speed v, at an angle
with respect to the horizontal. Ignore air resistance. (a) Find the speed of the ball when it hits the ground in terms of h, v,
, g. (b) For what value(s) of
is the speed of the ball greatest when it hits the ground?