physics

A spacecraft of mass 3.5 x 102kg was moving at 1.5 x 102ms-1 when its motor, operating at 8.4 x 102 kW fired for 5.0s Find the new velocity acquired by the spacecraft

I don't know how to find the new velocity
i found the work
Power = w/t
840 x 5 = W
4200J = W


Dont know what to do next

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asked by john
  1. (1/2) m Vnew^2 = (1/2) m Vold^2 + W

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    posted by Damon

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