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kvasek [131]
3 years ago
9

A ball is thrown straight up from a student's hand. Her hand is 2.0 m above the ground. The ball leaves the student's hand with

a speed of 15 m/s How long is the ball in the air before it hits the ground?
Advanced Placement (AP)
1 answer:
alexandr402 [8]3 years ago
3 0
X=15tcos90° y=2+15tsin90<span>°-4.9t^2
x=0 y=2+15t-4.9t^2
To find t when y=0, 0=-4.9t^2+15t+2

Quadratic formula makes t=.3135 or -7.8135
Clearly, the logical answer is the positive one. The ball is in the air .3135 seconds before it hits the ground.</span>
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