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)

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles

the speed of the cart after 3 seconds of low fan speed is ⇒ 54.0 cm/s.

the speed of the cart after 5 seconds of medium fan speed is ⇒ 120.0 cm/s.

the speed of the cart after 2 seconds of high fan speed is ⇒ 64.0 cm/s. 

just did the lab.