Which of the scenarios below involve an object experiencing zero net-force? [Ent

Question

Which of the scenarios below involve an object experiencing zero net-force? [Enter your answer as a string of the letter options you believe are correct For instance if you think options A D and E are correct, then enter ADE] A car tolls freely downhill. You throw a book straight up off of a table. A driver gradually accelerates in their car. A panicle s momentum is constant as it moves from one place to another. None of the above Answer: _______ Not yet correct, ONE try left!! A car, starting 60111 rest accelerates steadily to 60 mi/hr in 3 2 seconds. The car's mass is 1 8 metric tons. What is the total impulse exerted by the road on the car over this time interval? Answer: _________ What is the average force acting on the car? Answer: _______

Explanation / Answer

3) by newton's second law we have

F = dp/dt

d) a particle's momentum is constant as it moves from one place to another

dp = 0 so , F = 0

4) 1mi/h = 0.44704 m/s

60 mi/h = 60*0.44704 = 28.8224 m/s

mass of car = 1800 kg

total impulse = mv = 1800*28.8224 = 48280.32 kgm/s

5) average force= dp/dt = 48280.32 / 3.2 = 15087.6N

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