a) A student pushes a loaded sled whose mass m is 240kg for a distance d of 2.3m over the frictionless surface of a forzen lake. he exerts a constanthorizontal 130N force f=(29lb) as he does. if the sled starts from rest, what is its final velocity?
b) the student from the previous problem wants to reverse the direction of the velocity of the sled in 4.5s. with what constant force must he push on the sled to do so?