Answer:
45 N
Explanation:
The question can be solved by using Newton's second law:
F = ma
where
F is the net (unbalanced) force on the cyclist
m is the mass of the cyclist
a is his acceleration
In this problem:
m = 50 kg
[tex]a=0.9 m/s^2[/tex]
Therefore, the unbalanced force is
[tex]F=(50)(0.9)=45 N[/tex]
