question archive A football is kicked straight up into the air; it hits the ground 4
A football is kicked straight up into the air; it hits the ground 4
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A football is kicked straight up into the air; it hits the ground 4.4s later. What was the greatest height reached by the ball? Assume it is kicked from ground level. With what speed did it leave the kicker's foot?
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time down is 4.4 / 2 = 2.2 s
so by distance = 1/2 * a * t^2, with a = 9.81 and t = 2.2, distance = 23.74 m.
by a* t = v, final speed is 9.81*2.2 = 21.58m/s.
