Question

Kinetic Energy Problems = KE = 0.5m x 12

1. 5 kg wooden block moving at a speed of 2 m/s
2. 71kg man walking at 1.0 m/s
3. 71kg man running at 5.0 m/s
4. 1816kg car traveling at 25 m/s

Answer 1

Step-by-step explanation:

The kinetic energy of an object is given by :

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

1. Mass, m = 5 kg

Speed, v = 2 m/s

`K_1=(1)/(2)* 5* (2)^2\\\\=10\ J`

2. Mass, m = 71 kg

Speed, v = 1 m/s

`K_2=(1)/(2)* 71* (1)^2\\\\=35.5\ J`

3. Mass, m = 71 kg

Speed, v = 5 m/s

`K_3=(1)/(2)* 71* (5)^2\\\\=887.5\ J`

4. Mass, m = 1816 kg

Speed, v = 25 m/s

`K_4=(1)/(2)* 1816* (25)^2\\\\=567500\ J`