Question

19

What is the mass of a ball that is traveling 30 m/s and has 4.5 J of kinetic energy?
ave a GPF of 35512

Answer 1

Answer: The mass of ball is 10 grams.

Step-by-step explanation:

Given : Kinetic energy = 4.5 J

Velocity = 30 m/s

The formula for Kinetic energy is as follows.

`K.E = (1)/(2)mv^(2)`

where,

K.E = Kinetic energy

m = mass

v = velocity

Substitute the values into above formula as follows.

`K.E = (1)/(2)mv^(2)\\4.5 J = (1)/(2) * m * (30 m/s)^(2)\\m = (4.5 J * 2)/(900 m^2/s^2) (1 Js^(2) = kg m^(2))\\= 0.01 kg (1 kg = 1000 g)\\= 10 g`

Thus, we can conclude that the mass of ball is 10 grams.