Question

Which of the following has the greatest kinetic energy?

a
O
a 20 kg stone traveling at 10 m/s
O
a 40 kg ball traveling at 4 m/s
O
a 30 kg lead pipe traveling at 6 m/s
O
a 50 kg pillow traveling at 2 m/s

Answer 1

Answer: A 20kg rock traveling at 10 m/s

Step-by-step explanation:

The Formula for Kinetic Energy is KE = 0.5 x mv², using this equation you can then find the item with the most Kinetic Energy in Joules (J) 0.5 x 20 x 10 = 200 Joules.

Answer 2

a 20 kg stone traveling at 10 m/s.

Step-by-step explanation:

In this case the Kinetic Energy (KE) is the energy processes due to the stone's motion. To calculate the energy you should apply the formula as follows:

`KE=(1)/(2)m*v^(2)[(kg*m^(2) )/(s^(2) ) =J]`

Now, if you want to know what of the cases has the greatest kinetic energy, you need to calculate each one of these:

1. a 20 kg stone traveling at 10 m/s

`KE=(1)/(2)(20* (10)^(2))=1000J`

2. a 40 kg stone traveling at 4 m/s

`KE=(1)/(2)(40* (4)^(2))=320J`

3. a 30 kg stone traveling at 6 m/s

`KE=(1)/(2)(30* (6)^(2))=540J`

4. a 40 kg stone traveling at 4 m/s

`KE=(1)/(2)(50* (2)^(2))=100J`

Finally, if you compare the results of KE you could conclude that the greatest kinetic energy is 1000 J and correspond to 20 kg stone traveling at 10 m/s.

Rgds!