Answer:
Step-by-step explanation:
Given
Beta rocket has twice the mass of Alpha engine
suppose alpha has a mass of m so beta has 2 m mass
Thrust force on alpha is F
thrust force on beta is 2 F
Acceleration of alpha
![a_(alpha)=(F)/(m)](https://img.qammunity.org/2021/formulas/physics/high-school/48p8pqesxqa4ogidffvpp0c0hwca47gmdn.png)
Acceleration of beat
![a_(beta)=(2F)/(2m)=(F)/(m)](https://img.qammunity.org/2021/formulas/physics/high-school/ip3ydjs4blcjfir2f1d068918rfgo8rr5x.png)
Therefore acceleration of alpha and beta is same