Answer:
A star with 15 solar masses is too big to be a main-sequence star.
Either A or D. If I were answering I'd go with my git answer and say A
Answer:
read this it might help some
When a moving object collides with a stationary object of identical mass, the stationary object encounters the greater collision force. When a moving object collides with a stationary object of identical mass, the stationary object encounters the greater momentum change.
Explanation: