It depends on how long the force is applied for.
fg= M x g fg = 65kg x 9.8 m/s^2 fg = 637N
65kg = 143lb 4.81oz
The mass times the acceleration due to gravity. Bob is 65kg and he's standing on Earth. F=ma F=637N
65Kg
143.3 lbs
143 pounds is about 65kg
The acceleration of the sled is .18m/s2
65KG
mwhaha mwhaha
5605600J
65kg
90-75-98