Question

Kinetic Energy Problems = KE = 0.5m x 12

Answer 1

Explanation:

The kinetic energy of an object is given by :

$K=\dfrac{1}{2}mv^2$

1. Mass, m = 5 kg

Speed, v = 2 m/s

$K_1=\dfrac{1}{2}\times 5\times (2)^2\\\\=10\ J$

2. Mass, m = 71 kg

Speed, v = 1 m/s

$K_2=\dfrac{1}{2}\times 71\times (1)^2\\\\=35.5\ J$

3.  Mass, m = 71 kg

Speed, v = 5 m/s

$K_3=\dfrac{1}{2}\times 71\times (5)^2\\\\=887.5\ J$

4. Mass, m = 1816 kg

Speed, v = 25 m/s

$K_4=\dfrac{1}{2}\times 1816\times (25)^2\\\\=567500\ J$