1. Gwen exerts a 16 N horizontal force as she pulls a 32N sled across a cement

2. A student drops a ball from a window 7 m above the sidewalk. How fast is it moving when it hits the sidewalk?

3. A hockey puck has a coeffient of kinetic frictin of uk = 0.30 , if the puck feels a normal force (Fn) of 12 N, what is frictional force that acts on the puck?.