Q-A bullet was fired vertically upward from a riffle. The height risen by the bullet, x meters,
in a timet seconds after being fired, is given by x = 50t-5t.
(a) Calculate the speed, in m/s, of the bullet 4seconds after it was fired.
(b) Find the maximum height, in meters, risen by the bullet.
(c) Find the time, when the height of the bullet was 125m above the ground.
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