A ball is shot from a cannon into the air with an upward velocity of 40 ft/sec. The equation that gives the height (h) of the ball at any time (t) is: h(t)= -16t2 + 40ft + 1.5.

How long does it take the ball to reach a height of 20 feet?

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# A ball is shot from a cannon into the air with an upward velocity of 40 ft/sec. The equation that

A ball is shot from a cannon into the air with an upward velocity of 40 ft/sec. The equation that gives the height (h) of the ball at any time (t) is: h(t)= -16t2 + 40ft + 1.5.

How long does it take the ball to reach a height of 20 feet?