Question

An object has a velocity of 8 m/s and a kinetic energy of 480 j. what is the mass of the object?

Answer 1

Hello!

We have the following data:

KE (Kinetic Energy) = 480 J
m (mass) = ? (in Kg)
v (speed) = 8 m/s

Formula to calculate kinetic energy:

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

Solving:

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

$480 = \frac{1}{2} *m*8^2$

$480 = \frac{1}{2} *m*64$

$480*2 = 64*m$

$960 = 64m$

$64m = 960$

$m = \frac{960}{64}$

$\boxed{\boxed{m = 15\:Kg}}\end{array}}\qquad\checkmark$

Answer 2

KE=1/2*m*v^2
So 480=1/2 * m * 8^2
480=1/2 * m * 64
480=32 * m
480/32=m
15=m