Question

A girl pulls a sled with a force of 15 N over a distance of 3 m. What is the kinetic energy of the sled after she pulls it? Assume there is no friction.

Answer 1

The answer is 45 because you multiply 15 x 3 

Answer 2

Kinetic energy, KE = 45 J

Step-by-step explanation:

It is given that,

Force applied by girl on a sled, F = 15 N

It moves a distance, d = 3 m

We need to find the kinetic energy of the sled after she pulls it. We know that the work done is equal to the change in kinetic energy

`W=\Delta E=K_f-K_i`

`K_i=0` (initial at rest)

`KE=W=F* d`

`KE=15\ N* 3\ m=45\ J`

So, the kinetic energy of the sled after she pulls it is 45 J. Hence, this is the required solution.