1. The problem statement, all variables and given/known data An initially stationary 2.0kg object accelerates horizontally and uniformly to a speed of 10m/s in 3.0s. (a) In that 3.0s interval, how much work is done on the object by the force accelerating it? What is the instantaneous power due to that force (b) at the end of the interval and (c) at the end of the first half of the interval? 2. Relevant equations (a) W= F*d a= (V-Vi)/t F=ma (x-xi)=Vt-(1/2)a(t^2) (b) p= F*V 3. The attempt at a solution (a) I used the constant acceleration equation a= (V-Vi)/t and found that a= 3.33m/s^2 then I found force, F=(2)(3.33)= 6.66N then I found the distance= (10m/s)(3s)-(1/2)(3.33)(3^2)= 15.015m W= (6.66N)(15.015m)= 100J I don't know that my logic was correct in finding work. I tend to overcomplicate things & i may not have found acceleration correctly. (b) for instantaneous power i used p= F*V (dot product) so Fx*Vx= (6.66N)(10m/s)= 66.6W? I assumed my velocity at the end of the interval was 10m/s. And I assumed my force component would be the same because the problem is one dimensional. (c) t=1.5s so I plugged that time in to find a= 6.66m/s^2 and F=13.32N Then p=(13.32N)(10m/s)= 133.2?? Am I supposed to find V when d= 7.5m? I'm doing review problems for my midterm and I don't have access to a lot of the solutions. Any help would be appreciated. I just want to know if I'm doing these problems right & if not, then what's wrong with my logic. Thanks again.