posted by john .
staring from rest, a 3.5 kg object is acted upon by an unbalanced force and acquires a speed of 14.0 m/s after moving a distance of 35 m. find (a) the acceleration of the object, (b) the unbalanced force acting on the object, and (c) the time it takes for the object to attain a speed of 14.0 m/s
starting from rest (0 m/s) means that the average speed is 7 m/s
so it takes 5 s to go 35 m
acceleration = velocity / time = 14 / 5
force = mass * accel = 3.5 * 14/5