An object initially moving to the right is subjected to a constant force of magnitude…
PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
An object initially moving to the right is subjected to a constant force of magnitude F directed to the right for 2s, immediately followed by a constant force of the same magnitude F directed to the left for another 2s. No other horizontal forces act on the object. Which of the following best describes the net impulse delivered to the object and its resulting momentum after the 4s interval?
(a) Net impulse is 4Fs to the right; the object’s momentum increases.
(b) Net impulse is zero; the object’s momentum decreases.
(c) Net impulse is zero; the object’s momentum is unchanged.
(d) Net impulse is 2Fs to the right; the object’s momentum increases.