1. The problem statement, all variables and given/known data A small robotic spacecraft (m= 145kg) is initially moving in the +x-direction at .150 m/s. Then, its x-axis thruster exerts the following force on the spacecraft: Fx(t) = -5.00 N during 0s<t<1.5s -9.00 N during 1.5s< t< 3.25s -6.00 N during 3.25s <t< 4.00s When the thruster stops firing at t=4.00s, what is the spacecraft's final velocity? 2. Relevant equations v= mt2 3. The attempt at a solution well...don't you have to find the displacement/"?