The upper limit of the braking acceleration for most cars is about the same magn
ID: 1593240 • Letter: T
Question
The upper limit of the braking acceleration for most cars is about the same magnitude as the acceleration due to gravity on Earth. Compare the braking motion of a car with a ball thrown straight upward. Both have the same initial speed. Ignore air resistance. (Select all that apply.)
1.The acceleration due to gravity is constant in both magnitude (g) and direction (down). When a ball is thrown straight up, its acceleration vector points in the opposite direction to its velocity vector, which means it slows down and eventually stops
.2.Assuming the braking acceleration of the car is constant in magnitude (g) and points opposite to the car's velocity vector, it, too, will slow down and eventually stop.
3.The acceleration due to gravity is not constant in both magnitude (g) and direction (down). When a ball is thrown straight up, its acceleration vector points in the same direction as its velocity vector, which means it speeds up and never stops
4..Assuming the braking acceleration of the car is constant in magnitude (g) and points opposite to the car's velocity vector, it, too, will not slow down and never stop.
5.If the ball and the car start at the same initial speed and have the same acceleration, the ball and the car will take the same amount of time to come to rest.
Explanation / Answer
1.The acceleration due to gravity is constant in both magnitude (g) and direction (down). When a ball is thrown straight up, its acceleration vector points in the opposite direction to its velocity vector, which means it slows down and eventually stops
2.Assuming the braking acceleration of the car is constant in magnitude (g) and points opposite to the car's velocity vector, it, too, will slow down and eventually stop.
5.If the ball and the car start at the same initial speed and have the same acceleration, the ball and the car will take the same amount of time to come to rest.
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