If the effects of atmospheric resistance are accounted for, a freely falling body has an acceleration defined by the equation below where v in m/s and the positive direction is downward. a = 9.81 [1-v2 (10-4 )] (m/s2 ) if the body is released from rest at a very high altitude, determine the body’s terminal or maximum attainable speed (as time approaches infinity). velocity is maximum when acceleration is zero!

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000