Question

If a ball has kinetic energy of 1000 joules and a speed of 5m/s, what is its mass?

Answer 1

Answer:

m = 80[kg]

Explanation:

The kinetic energy can be calculated by means of the following equation.

$E_{k}=\frac{1}{2}*m*v^{2}$

where:

m = mass [kg]

v = velocity = 5 [m/s]

Ek = kinetic energy = 1000 [J]

Now replacing:

$1000 = \frac{1}{2} *m*5^{2}\\2000 = 25*m\\m=80[kg]$