Evaluate the force a skateboard exerts on you if ur mass is 60kg and you push on the skateboard with a force of 60n ?

Which of the following is not am example of a polymer? protein nylon kevlar concreta

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below.your friend goes first,and you follow after he has dropped a distance of 2.0m.when your friend hits the water,is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

Anybody wanna ? (picture included? )