a) An apple falls from a tree down to the ground. As the apple falls, which of the following would apply? i) The apple accelerates downwards and the Earth accelerates upwards, both at the same rate. ii)The apple remains stationary and the Earth accelerates upwards. iii) The apple accelerates downwards and the Earth accelerates upwards but at different rates. iv) The apple accelerates downwards, and the Earth remains stationary.
Read each question below, then choose the correct answer
a) An apple falls from a tree down to the ground. As the apple falls, which of the following would apply?
i) The apple accelerates downwards and the Earth accelerates upwards, both at the same rate.
ii)The apple remains stationary and the Earth accelerates upwards.
iii) The apple accelerates downwards and the Earth accelerates upwards but at different rates.
iv) The apple accelerates downwards, and the Earth remains stationary.
b) You're a police officer examining the scene of a car crash that killed someone driving a Tesla. There was a collision involving them and a pickup truck. The truck driver, who survived, said he was traveling North into the intersection and the Tesla was traveling East into the intersection. The truck driver claims that he was not exceeding the speed limit when the accident occurred. You note the posted speed limit was 80 km/h. Like airplanes, Teslas have a black box that records various statistics in the event a collision occurs. After analyzing the data from the black box, you discover that Tesla was driving at a velocity of 67.5 km/h [E] when the collision occurred. You google the mass of both of the vehicles and find the Tesla should be about 2300 kg and the truck should be about 2920 kg. During the collision, the two vehicles crumpled and became entangled, the skid marks revealing that the two vehicles traveled E 69° N after impact. How fast, in km/h, was the truck actually driving at the moment of impact? Be clear and show all your work. (HANDWRITTEN ANSWER)
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