(adsbygoogle = window.adsbygoogle || []).push({}); [SOLVED] Acceleration, displacement, Kinematics Question

1. Superwoman is hovering above the ground when a person free-falling goes by her at a terminal velocity of 140 km/h. Unforunately, the parachute does not open. Forunately, Superwoman is around. If it takes her 1.9 s to realize the person is in distress, what mus her acceleration be if she is to catch the parachutist just before she hits the ground 1000 m below?

2. I think you use the equation d= v*t + 0.5 a*t^2 and rearrange for a which i got as a=d-v*t/ t^2

3. So I plugged in the numbers given in the question

a=d-v*t/ t^2

= (1000m) -(38.89) (1.9) / 1.9^2

=926.1/3.61

=256 m/s^2

That doesn't look right to me. The answer is supposed to be 3.53 m/s^2. I have no clue what I'm doing wrong! =( Please help! TIA.

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# Homework Help: Acceleration, displacement, Kinematics Question

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