Question
Asked Sep 12, 2019
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A ball is thrown straight upward with a velocity of 39 m/s. How much time passes before the ball strikes the ground? (disregard air resistance (drag))

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Expert Answer

Step 1

According to the kinematics equation,

Substitute the values, to find the time.

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h=vf 0-(39m/s)t(9.80ms")r 0 39t-4.9t 4.9t2-39t0=0

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Step 2

Solve the above quadrati...

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-btb-4ac 2 2а 39+ К39)* - 4(49)0) 2(4.9) =8.0s

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Kinematics

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