The feather and hammer accelerate at the same rate. Thistells you there is no at

Question

The feather and hammer accelerate at the same rate. Thistells you there is no atmosphere and therefore no friction. The only force acting on a freely falling object is gravity.

You measure the acceleration of the hammer.

Dy = (1/2)at2, Dy = 1.4 m, t = 29.2 s, solve fora..

Newton’s 2nd law: a = F/mhammer

The hammer accelerates because the force of gravity acts onit. From Newton’s law of gravity we have F =Gmhammermplanet/R2.

Therefore a = F/mhammer =Gmplanet/R2.

mplanet = a R2/G

If you knew R you could solve for mplanet. Hereis where the walk comes in. By walking around the planet youdetermine the planets circumference. 2pR = 25000 m.

Explanation / Answer

You are right, answer: A

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