# AP (Advanced Placement) Physics(B-C): Questions 13 - 15 of 921

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## Question 13

### Question

MCQ▾

A stone is thrown vertically upward from ground. It take time of to reached again on the ground. Which one of the following gives velocity of stone, when it just before hits the ground? (Assume the air friction is negligible.)

### Choices

Choice (5)Response

a.

b.

c.

d.

e.

All of the above

## Question 14

### Question

MCQ▾

A box is sitting stationary on a ramp tilted at an angle of to horizontal, which is the maximum angle at which the ramp can be tilted without the box sliding. The ramp is then tilted to a larger angle so that the box begins to slide. As the angle of the ramp is increased from to , what happens to the kinetic friction force and the normal force of the ramp on the box?

### Choices

Choice (5)Response

a.

The friction force increases and the normal force increases.

b.

The friction force remains constant and the normal force decreases.

c.

The friction force remains constant and the normal force remains constant.

d.

The friction force decreases and the normal force decreases.

e.

Question does not provide sufficient data or is vague

## Question 15

### Question

MCQ▾

If quantity is measured in newtons and quantity Y is measured in , determine the units on the calculated quantity .

### Choices

Choice (5)Response

a.

b.

c.

d.

e.

None of the above

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