Question

The function h(t) = 125t - 5t2 represents the height "h" of an object "***

seconds after it was launched into the air from the ground. How many seconds will it take for the object to hit the ground? Round to the nearest tenth.

Answer 1

Correct option is D)

When the ball hits the ground, h=0

⇒−4.9t

2

+25t=0

⇒4.9t

2

=25t

⇒t=0 or 4.9t=25=>t is approximately equal to 5

Thus, after 5 seconds, the ball hits the ground.

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