Question

A rabbit jumps at a speed of 15 m/s and has 220 J of kinetic energy.
What is its mass?

Answer 1

`\huge\boxed{\sf m=1.96 \ kg}`

Step-by-step explanation:

Given Data:

Speed = v = 15 m/s

Kinetic Energy = K.E. = 220 J

Required:

Mass = m = ?

Formula:

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

Solution:

Put the givens

`\displaystyle 220 =(1)/(2) m(15)^2\\\\* 2 \ to \ both \ sides\\\\220 * 2 = m (225)\\\\440 = m (220)\\\\Divide \ 220\ to \ both \ sides\\\\440/225 = m\\\\1.96 \ kg=m\\\\m=1.96 \ kg\\\\\rule[225]{225}{2}`