I'm assuming a typo here, where all of the figures are typed twice. So let the speeds of the trains be n and n+20. Then:
8n+8(n+20)=960
16n=800
n=50
n+20=70
☺☺☺☺
To solve this problem we will use the concepts related to the resulting Vector Force product of two components, that is,
If we take the Force of 50 N as the force in the X direction and the Force of 40 N in the Y direction we will have to:
Finally, since Newton's second law, acceleration can be determined as
Therefore the resultant magnitude of the acceleration of the object is
The answer is D obviously as that is unnecessary for the Earth
The answer you are looking for is True a neutron star is known for being calls a Red giant.