# AP (Advanced Placement) Physics(B-C): Questions 48 - 50 of 921

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## Question 48

### Question

MCQ▾

Three boxes connected by strings, as shown in the illustration, are pulled across a level surface so that they accelerate at . The boxes are all made of the same material, so the coefficient of kinetic friction between each box and the surface is . What is the pulling force that is applied to the right of the box?

### Choices

Choice (5)Response

a.

b.

c.

d.

e.

Question does not provide sufficient data or is vague

## Question 49

### Question

MCQ▾

A Ping-Pong ball is dropped from the top of a building. As it falls, it will reach terminal velocity when:

### Choices

Choice (5)Response

a.

The air drag force becomes greater than the weight of the ball

b.

The force accelerating the ball reaches its maximum

c.

The final velocity of the ball is zero

d.

The vertical forces on the ball reach equilibrium, so that acceleration will be zero

e.

All of the above

## Question 50

### Question

MCQ▾

Consider a box slides across a flat roof of height from the ground with constant speed . If it leaves from the edge of flat roof at the same speed horizontally, then which one of the following is true for the horizontal and vertical components of the box՚s velocity, when it hits the ground?

### Choices

Choice (5)Response

a.

Horizontal velocity increases and vertical velocity decreases.

b.

Horizontal velocity increases and vertical velocity becomes zero.

c.

Horizontal velocity decreases and vertical velocity increases.

d.

Horizontal velocity remains same and vertical velocity increases.

e.

None of the above

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