Question

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Which of the following has the greatest kinetic energy?
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 Stone traveling an 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

The 20 kg stone traveling at 10m/s

Step-by-step explanation:

Hi, the kinetic energy is the energy available of the objects in movement.

That energy can be calculated be the next formula:

`ec=0.5*m*v^2`

Where:

• ec is the kinetic energy [J]
• m is the mass of the object [kg]
• v is the velocity of the object [m/s]

Case A:

`ec=0.5*20kg*(10m/s)^2`

`ec=1000 J`

Case B:

`ec=0.5*40kg*(4m/s)^2`

`ec=320 J`

Case C:

`ec=0.5*30kg*(6m/s)^2`

`ec=540 J`

Case D:

`ec=0.5*50kg*(2m/s)^2`

`ec=100 J`