# Blasting off from Planet X

Pro Problems > Physics > Energy and Work > Work## Blasting off from Planet X

An astronaut is in a lander, which is taking off from Planet X. The lander's thrusters do 12,288,000 Joules of work lifting the lander (at a constant speed) to a height of 1000 meters.

If the astronaut had bailed out first, the lander could have risen to a height of 1024 meters doing that same amount of work.

If the lander, with astronaut on board) had done the same amount of work accelerating horizontally, it would have reached a speed of 40What is the acceleration due to gravity on Planet X?

## Solution

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