A 2.0kg object initially at rest at the origin is subjected to a time-varied force. What is the objects velocity at 4 seconds? The Graph For the first two seconds there is a force of 6.0N. The the force decreases linearaly to 0N at 4 seconds. How do I find the velocity of the object at 4.0 seconds? I got the velocity at 2 seconds by using F=ma and solving for a: 6.0=2.0a a=3 With that acceleration I then found: V=Vi+at V=0+(3)(2) V=6 I just don't know how to get the rest.