A0.0427 kg racquet-ball is moving
22.3 m/s when it strikes a
stationary box. the ball bounces
back at 11.5 m/s, while the box
moves forward at 1.53 m/s. what
is the mass of the box?
(unit = kg)

Mass of the box = 0.9433 kg

Explanation:

Mass of racket-ball = 0.00427 kg

Velocity of racket-ball before collision = 22.3 m/s

Velocity of racket-ball after collision with box = -11.5 m/s

[Since ball is bouncing back, so velocity is taken negative.]

Velocity of the box before collision = 0 m/s

[Since the box is stationary, so velocity is taken zero]

Velocity of box moving forward after collision = 1.53 m/s

To find the mas of the box .

By law of conservation of momentum we have:

Momentum before collision = Momentum after collision

This can be written as:

We can plugin the given value to find

Adding both sides by 0.4911

Dividing both sides by 1.53.

∴ kg

Mass of the box = 0.9433 kg (Answer)

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.