During the first two minutes of flight, the SRB and main engine accelerate at a rate of 52.16 m/s2.
Acceleration: the rate at which the speed and direction of a moving object vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates. The provided parameters are the engine's initial velocity (u), its end velocity (v), and the time of motion (t), which is equal to two minutes (2 x 60 s).
Following are the calculations for the main engine and SRB's acceleration.
a= Δv / Δt
a=7600-1341 /2*60s
a=52.16 m/s²
Consequently, 52.16 m/s2 is the acceleration of the main engine and SRB during the first two minutes of flight.
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