(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A meteor has a speed of 94.0 m/s when 700 km above the Earth. It is falling vertically (ignore air resistance) and strikes a bed of sand in which it is brought to rest in 3.03 m.

a) What is its speed just before striking the sand?

b) How much work does the sand do to stop the meteor (mass = 545 kg)?

c) What is the average force exerted by the sand on the meteor?

(d) How much thermal energy is produced?

2. Relevant equations

KE=0.5*m*v^2

Work=force*distance

vf^2=vi^2+2a(xf-xi)

3. The attempt at a solution

I'm having trouble with the first part, and it looks like the answer for it is required for the other parts.

I tried using vf^2=vi^2+2a(xf-xi) to find the velocity for part a. Plugging in the numbers gives vf^2=(94 m/s)^2+2(9.8 m/s^2)(700000m). This results in vf=3705.244, however this is not correct. What am I doing wrong?

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# Homework Help: Velocity, Work, and Energy of a Falling Meteor

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