- #1

MozAngeles

- 101

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## Homework Statement

On Apollo Moon missions, the lunar module would blast off from the Moon's surface and dock with the command module in lunar orbit. After docking, the lunar module would be jettisoned and allowed to crash back onto the lunar surface. Seismometers placed on the Moon's surface by the astronauts would then pick up the resulting seismic waves.

Find the impact speed of the lunar module, given that it is jettisoned from an orbit 100 km above the lunar surface moving with a speed of 1550 m/s.

v(final) =--------------m/s

## Homework Equations

KEfinal + PEfinal = KEinital + PEinital

It is the gravitational potential energy = -GMm/r

KE=1/2mv

^{2}

G is a universal constant = 6.67 x 10

^{-11}Nm

^{2}/kg

^{2}

M = mass of the moon

r = distance of the module from the center of the moon.

M = 7.349 x 10

^{22}kg

radius of the moon = 1737.1 km

rinitial = 100*10

^{3}m?? don't know if this is right..

rfinal = 100*10

^{3}m

## The Attempt at a Solution

No idea where to start except that E(inital)=E(final)