Question

1. What is the Kinetic energy of a 1500 kg car going at a speed of 14 meters/second?

Show your work below

2. What is the KE if m = 2 and v = 5?

3. What is the KE if m = 4 and v = 5?

4. What is the KE if m = 2 and v = 10?

Answer 1

Kinetic energy is 147000 Kgm/sec^2 or joules

Kinetic energy is 25 kgm/sec^2 or joules

Kinetic energy is 50 kgm/sec^2 or joules

Kinetic energy is 100 kgm/sec^2 or joules

Explanation:

We know that KE= 1/2mv^2

where KE is kinetic energy, m is mass in kg and v is velocity meter/sec.

In first case,

m=1500 kg, v= 14 m/sec or joules

KE= 1/2* 1500*14*14

=147000 Kgm/sec^2

In second case,

m=2 Kg, v= 5 m/sec

KE= I/2 *2*5*5

= 25 kgm/sec^2 or joules

in third case,

m=4 kg, v=5 m/sec

KE= 1/2*4*5*5

= 50 Kgm/sec^2 or joules

in fourth case,

m= 2 kg, v= 10 m/sec

KE= 1/2*2*10*10

=100 kgm/sec^2 or joules