This is a revision question for a test ive got. Just want to check my answer.(adsbygoogle = window.adsbygoogle || []).push({});

An asteroid with mass of 1.8*10^{15}kg and radius of 6.7km attracts a spacecraft that has come into its gravitational influence. What speed will the spcaecraft crash into the surface. intial speed of spacecraft is negilable.

its a multiply choice and i choose it is impossible to calculate without knowing the mass of the spacecraft.

the equation i would have used is -Gm1m2/r

this right? or is there a way of working out the speed without knowing the mass?

thanks

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# Homework Help: Speed due to gravity

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