Originally Posted by
johnnymeboy
This is for a basic physics undergrad course, with no math what so ever....just the basic principles....I know the first one is because of Newtons first laws....However the second question all i have to use is F=GmM/R^2
1. Bob is on his bicycle and is travelling to the right at 10 km/hr. He is struck by a car that is moving upwards at 1 km/hr. Which way does Bob travel after being hit?
Bob >
^

Car
2. Two tennis balls of equal mass are at rest. The first is on the surface of the Earth and the second is on the surface of the Moon. If the first ball is suddenly given a speed v1 and then allowed to move naturally, it just escapes from and does not return to the Earth. If the second ball is similarly given a speed v2, it just escapes from and does not return to the Moon. Which is larger, v1 or v2? The Moon has no atmosphere. Ignore the air resistance due to the Earth's atmosphere.