A few days ago
litgeek45

Help with this physics problem?

Can someone explain to me how to do this physics problem? It would be much appreciated.

A 0.14-kg pinecone falls 16 m to the ground, where it lands with a speed of 13 m/s. With what speed would the pinecone have landed if there had been no air resistance.

Top 1 Answers
A few days ago
A.V.R.

Favorite Answer

The weight is irrelevant.

16 = 4.9t^2 (from s = ut + 0.5at^2)

from this, t = 4/sqrt(4.9)

Velocity on free fall v = 9.8t = 2 x sqrt(4.9) x 4 (from v = u + at)

= 17.71 m/sec

s- distance travelled, v-final velocity, u-initial velocity, a-acceleration, t-time

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