Solving Energy Problems: Q on Acceleration, Distance, Force & Friction

[Alain12345]

My teacher assigned a few problems, and I'm having difficulty with one of them. The question is:

In order to accelerate a 2 kg car from rest to a speed of 16 m/s, 400 J of work are done by the motor of the car. The acceleration takes 10s. Calculate:

a) the distance moved by the the car (I got 80 m)
b) its acceleration (1.6 m/s2)
c) the force provided by the motor
d) the frictional force opposing the car's motion
e) the work done to overcome friction
f) the final kinetic energy of the car

I need help especially with c and d. Thanks.

 

[JSBeckton]

c) W=fd
f=W/d

 

[daniel_i_l]

d) find the work that was done on the car to get to 16m/s^2, it should be less than 400J, the difference is the work done by friction. Since the force is constant, just divide that work by the distance to get the force.