An object is moving in the absence of a net force. which of the following best describes the object's motion?

the object will speed up at a constant rate until it reaches a maximum speed.
the object will continue to move with a constant velocity.
the object will slow down at a constant rate until coming to rest.
the object will stop moving immediately and remain at rest until acted on by a net force.
the object will continue to move with a constant speed, traveling in a circular path.

Explanation:

An object is moving in the absence of a net force. It means the net force acting on the object is zero. According to Newton's second law of motion, the force acting on the object is given by :

According to given condition, F = 0

Mass of the object cannot be equal to 0.

v = u

Final velocity = initial velocity

i.e. the final speed of the ball is equal to its initial speed. It means, the object will continue to move with a constant velocity. Hence, the correct option is (a).

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

asthenosphere and convection