The U.S army's parachuting team, the Golden Knights, are on a routine jumping mission over a deserted beach. On a jump, a 65 kg Knight lands on the beach with a speed of 4.0 m/s, making a .20 m deep indentation in the sand. With what average force did the parachuter hit the sand?

Answer 1

Vf^2=Vi^2+2ad but a= F/mass
solve for force.

Answer 2

2600

Answer 3

-5200 N