i need a little help on this problem and i'm not sure if i have the equation down right. a 1990kg car accelerates uniformly fromrest to a speed of 17.1 m/s in 4.21 sec. now the question states what is the instantaneous power delivered by the net force to the car at 2s. answer in units of w. so this is what i did. i know that the equation is P=dw/dt which is F*v to find F i did F=ma but i need to find out what a is vf=vi+at vf=vi+at 17.1m/s = 0 m/s + a(2s) a = 8.55 m/s F = 1990kg (8.55m/s) = 17014.5 then i plug all that into P= F*v P = 17014.5 * 17.1 m/s = 290947.95 but thats wrong (online submit). my instructor told the class that v in that equation is the final velocity. am i doing something wrong here. i already found the average power in for the 4.21s and i already found work done.