Question

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Answer 1

Answer:

The 20 kg stone traveling at 10m/s

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:

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

$ec=100 J$

Answer 2

Answer: A 20kg Stone traveling an 10 m/s

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.