Free Fall

Classical Mechanics Level 2

A camera fell from a plane flying horizontally and it took 27 seconds to reach the ground. If air resistance is neglected, calculate the height of the plane (in km \text{km} ) at which it was flying at that moment from the ground. Take g = 9.8 m s − 2 g = \SI{9.8}{\meter\per\second\squared} .

Submit your answer to 1 decimal place.


The answer is 3.6.

D Kartikeyan by D Kartikeyan , 25, India

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1 solution

D Kartikeyan
Mar 31, 2017

s = ut + 1/2 at^2

Initial velocity = u = 0;

So,

s = 1/2 at^2

here, a = g = 9.8 m/s^2 and t = 27 s

s = 1/2 (9.8 * 27 * 27)

s = 1/2 (7144.2)

s = 3572.1 m

s = 3.5 km (approx.)

1 Helpful 0 Interesting 0 Brilliant 0 Confused

Please tell what to take for g g ? Because for 10 m / s 2 10m/s^2 and 9.8 m / s 2 9.8 m/s^2 answers are very different.

Md Zuhair - 4 years, 2 months ago

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