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 Form 3 Physics Newton's laws of motion questions and answers

An object of the mass 150kg moving at 20m/s collides with a stationary object of mass 90kg.They couple after collision
.Determine the :
i).Total momentum before collision
ii) Total momentum after collision
iii) Their common velocity after collision

 (2m 44s)
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Answer Text:
i).m1v1 +m2u2
#(150times20)+90times0#
3000kgm/s
ii).(150+90)
240vkgm/s
iii)3000 = 240
v =12.5 m/s


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