Answer:
10 kg
Explanation:
First you need to find the Force from the first section
F = M x A
F = 5.0 kg x 0.20 m/s²
F = 1 N
Now you can use the same Force to find the Mass in the second section.
F = M x A or rearranged, F / A = M
1 N / 0.10 m/s² = 10 kg
If you look at the question, the Acceleration in the last section is half of what it is in the first section. The F=MxA equation means that if the Force remains the same, if A decreasing, then M must increase. If M decreases, then A will increase. It makes sense if you think in physical terms.
If you push on a huge rock, you can move it 1 foot. Now if the mass of that rock were cut in half, you should be able to move it twice as far pushing just as hard as you did on the huge rock.
