Question

A car of mass 400kg travelling at 72km/h crashes onto a truck of mass 400kg and travelling at 9km/h in the same direction. The car bounces back at a speed of 18km/h. Find the Speed of the truck after the impact.

Answer 1

Answer:

Using momentum conservation

mtruckvtruckmcarucar+mtruckutruck=mcarvcar+mtruckvtruck

400×72+4000×9=−18×400+4000×v

v=18 kmph

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Answer 2

Using momentum conservation,

$mcarucar \: + \: mtruckutruck=mcarvcar \: + \: mtruckvtruck</p><p>$

$400×72+4000×9=−18×400+4000×v</p><p></p><p></p><p>v=18 kmph</p><p></p><p>$

Therefore, 18km /hr