# AP (Advanced Placement) Physics(B-C): Questions 48 - 50 of 920

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## Question number: 48

MCQ▾

### Question

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.

None of the above

## Question number: 49

MCQ▾

### Question

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

b.

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

c.

The final velocity of the ball is zero

d.

The force accelerating the ball reaches its maximum

e.

All of the above

## Question number: 50

MCQ▾

### Question

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 becomes zero.

b.

Horizontal velocity increases and vertical velocity decreases.

c.

Horizontal velocity remains same and vertical velocity increases.

d.

Horizontal velocity decreases and vertical velocity increases.

e.

Question does not provide sufficient data or is vague

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