Newtons 2nd Law - Acceleration Problem

[Speedking96]

Homework Statement

Starting from a rest position, how long will it take a 50 kg cyclist riding a 10 kg bike to reach a speed of 4 m/s if the resultant force acting on the bicycle is 48 N?

Homework Equations

F=ma
Vf=Vi + at

The Attempt at a Solution

F=ma
(F-48)=(50+10)(a)

At this point I have to unknowns and one apparent equation.

 

[Doc Al]

F=ma
(F-48)=(50+10)(a)

At this point I have to unknowns and one apparent equation.

You are told that the resultant force is 48 N, so why did you write "F - 48"?

 

[BOYLANATOR]

What is your reasoning for the left side of the equation?

 

[adjacent]

1.
F=ma
(F-48)=(50+10)(a)

The resultant force means the net force.It's not the opposite force