A1.14x10^4 kg lunar landing craft is about to touch down on he surface of the moon, where the acceleration due to gravity is 1.6 m/s^2. at an altitude of 165m the craft's downward velocity is 18.0m/s. to slow down the craft, a retrorocket is firing to provide an upward thrust. assuming the decent is vertical find the magnitude of the thrust needed to reduce the velocity to zero at the instant when the craft touches the lunar surface.

What is work? how much work is done to move an object 0 meters?

Ascientific blank must be testable and capable of being proven false?

16. a brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force of 800 n on him. the mass of the losing player plus equipment is 90.0 kg, and he is accelerating at 1.20m/s2 size 12{1 "." "20"" m/s" rsup { size 8{2} } } {} backward. (a) what is the force of friction between the losing player’s feet and the grass? (b) what force does the winning player exert on the ground to move forward if his mass plus equipment is 110 kg? (c) draw a sketch of the situation showing the system of interest used to solve each part. for this situation, draw a free-body diagram and write the net force equation.