Answer:
42.5N
Explanation:
According to the Newton's second law of motion:
The net force is equated to the product of the mass times the acceleration.
Force(F)=mass(m)*acceleration(a)
first we have to find the acceleration of the bicycle
[tex]accceleration=\frac{Velocity .difference}{time} \\a=\frac{(4-0)ms^{-1} }{8s} \\a=0.5ms^{-2}[/tex]
[tex]F=85kg*0.5ms^{-2}\\ =42.5N[/tex]
