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A landing craft of mass 12,000kg prepares its self for a moon

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A landing craft of mass 12,000kg prepares it's self for a moon landing. When at a vertical distance 160m above the Moon's surface it's downward velocity is 15m/s. A retrorocket is fired to give the craft an upwards thrust to slowits speed to zero as it meets the surface.

Calculate the thrust needed to decelerate the craft's downward velocity to zero as it lands. The value for gravity on the moon is g/6. Where g is 9.81 m/s^2
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See the attached file for the solution.

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