Yes a kg of hydrogen will have more atoms than a kg of lead, because lead has a higher atomic mass, than hydrogen so it will take more atoms of hydrogen to make a kg than lead
- (spring constant) (new length of spring - original length of spring) = Force applied to spring.
that is
-kx=F
Did you only have how far the cart traveled? No mass or acceleration or speed or time taken?
Answer:
0.44807175m
Explanation:
k = Spring constant =
(Assumed, as it is not given)
g = Acceleration due to gravity = 9.81 m/s²
Total mass is

The total weight will balance the spring force

The springs are compressed by 0.44807175m