Question

 A sled is pulled 65 meters at an angle of 45 degrees. If 900 J of work was used how much force in N was used to pull the sled?

Answer 1

By the definition of the work done we have:

$$W=Fscos\theta,$$ $$F=\dfrac{W}{scos\theta}=\dfrac{900\ J}{65\ m\cdot cos45^{\circ}}=19.6\ N.$$

Answer:

$F=19.6\ N.$