Small rockets are used to make tiny adjustments in the speeds of satellites. One

Question

Small rockets are used to make tiny adjustments in the speeds of satellites. One such rocket has a thrust of 35 N. If it is fired to change the velocity of a 71900 kg spacecraft by 63 cm/s, how long should it be fired?
min

A 2590-kg van runs into the back of a 821-kg compact car at rest. They move off together at 8.5 m/s. Assuming the friction with the road is negligible, calculate the initial speed of the van.
m/s

Explanation / Answer

change in momentum=mass*velocity=force*time =>35*t=71900*.63 =>t=1294.2 sec initial momentum=final momentum =>2590*v=(2590+821)*8.5 =>v=11.19

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