Answer:
2.5 kg
Explanation:
We can solve the problem by using Newton's second law:
[tex]F=ma[/tex]
where
F is the net force acting on the train
m is the mass of the train
a is the acceleration
For the toy train in the problem,
F = 3.0 N
a = 1.2 m/s^2
So we can solve the formula for m, to find the mass of the train:
[tex]m=\frac{F}{a}=\frac{3.0 N}{1.2 m/s^2}=2.5 kg[/tex]
