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Q. A 2200 kg sport utility vehicle travelling at 86 km/h can be stopped in 0.15 s if it hits a concrete wall. Presume a 60 kg person was in the car that hit this wall. The velocity of the person equals that of car both before and after the crash, and the velocity changes in 0.15 s.

Q. Find out the gravitational force of attraction between the moon and the earth, given the following: Me = 5.98 x 1024kg, Mm = 7.25 x 1022 kg,d = 3.85 x 10^8m

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