How much work is required for a 68 kg runner to accelerate from rest to a speed of 6.5 m/s ?

The Kinetic energy will be "1436.5 Joules".

Given values are:

Mass,

Speed,

As we know the formula,

→

By substituting the given values, we get

→                          

→                          

→                          

→                          

Thus the above answer is appropriate.

Learn more about K.E here:

link

-- When he's at rest, his kinetic energy is zero.

-- When he reaches 6.5 m/s, his kinetic energy is . . .

KE = (1/2) (m) (v²)

KE = (34 kg) (42.25 m²/s²)

KE = 1,436.5 Joules

That's the amount of energy that has to come from somewhere, in order to boost him to that speed.

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )