A 0.60 kg object is at rest. A 3.24 N force to the right acts on the object for 1.31 s followed by a constant force of 4.35 N to the left is applied for 2.69 s. What is the velocity at the end of the 2.69 s
The object has a mass of 0.6 kg. For 1.31 s a force equal to 3.24 N acts on the object towards the right followed by a force of 4.35 N towards the left for 2.69 s.
The acceleration of an object with mass m due to a force F is given by a = F/m.
For the first 1.31 s, the object is accelerated to the right at 3.24/0.6 = 5.4 m/s^2. The final velocity of the object is 0 + 5.4*1.31 = 7.074 m/s towards the right. The force of 4.35 N that is applied later, accelerates the object at 4.35/.6 = 7.25 m/s^2 towards the left. The final velocity of the object after 2.69 s is 7.074 - 7.25*2.69 = 12.4285 m/s towards the left.
After the application of both the forces the velocity of the object is 12.4285 m/s towards the left.