In a pole-sliding game among friends, a 86 man makes a total vertical drop of 8.0 while gripping the pole wh?

In a pole-sliding game among friends, a 86 man makes a total vertical drop of 8.0 while gripping the pole which exerts and upward force (call it ) on him. Starting from rest and sliding with a constant acceleration, his slide takes 2.4 .What is the magnitude of the upward force exerted on the man by the pole? Please help.