Calculate the work done by the applied force accelerating a 2 kg object at 3 m/s/s over 4 m if there is a 2.5 frictional force of resistance. I calculated using F=ma=6N; then net force = 6N-2.5N=3.5 N so W=fd=14J. Did I do this correctly? Thanks

Question

Calculate the work done by the applied force accelerating a 2 kg object at 3 m/s/s over 4 m if there is a 2.5 frictional force of resistance. I calculated  using F=ma=6N; then net force = 6N-2.5N=3.5 N so W=fd=14J. Did I do this correctly? Thanks

bobpursley · Answer

work done=2.5*3 + 2*3*4 I get more than you. You did the accelerating force only, you have to add the force working against friction

KC · Answer

Help!I'm really lost on this one.

bobpursley · Answer

correction: I mistyped the distance on friction. Workdone=2.5*4+2*3*4 joules.