Question

A running back with a mass of 70 kg travels down the field with a velocity of 5.0 m s . Calculate the kinetic energy of the football player.

Answer 1

K.E = 1/2 mv²

    =  1/2 (70kg) (5.0ms)²

    =  1 ˣ ( 1750) / 2

    = 875 kgms²

     

Answer 2

The kinetic energy of the football player is 875kg.m/s

Kinetic Energy

• Kinetic energy is defined as the mass of an object and its velocity or speed.
• It is a scalar quantity
• K.E = 1/2*m*v^2

How to Calculate the kinetic energy?

• The mass of football player given is 70kg
• The velocity of football player given is 5.0m/s
• We need to calculate the kinetic energy of the football player

Substituting the values in the formula

K.E= 1/2mv^2

= 1/2*(70)*(5.0)*(5.0)

=1/2(1750)

= 875

The Kinetic energy of the football player is 875kg.m/s

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