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## Homework Statement

A landing craft of mass 12,000 kg prepares itself for a Moon landing. When at a

vertical distance 160m above the Moon’s surface it’s downwards velocity is 15 m/s.

A retrorocket is fired to give the craft an upward thrust to slow its speed to zero as it

meets the surface. Calculate the needed thrust to decelerate the craft its initial

downwards velocity to zero as it lands. The value for gravity on the Moon is g/6.

(Where g is 9.81m/s2).

## Homework Equations

f=ma

## The Attempt at a Solution

Gravity =9.81/6

=1.635

F (craft)= ma

=12 000. 1.635

=19620

Therefore the craft will need a a thrust of 19620 N upwards. Is that right or is that other information needed??