4.7 | If the rocket sled shown in Figure 4.31 starts with only one rocket burning, what is the

(a) If the rocket sled shown in Figure 4.31 starts with only one rocket burning, what is the magnitude of its acceleration? Assume that the mass of the system is 2100 kg, the thrust T is 2.4×10^4 N, and the force of friction opposing the motion is known to be 650 N. (b) Why is the acceleration not one-
fourth of what it is with all rockets burning?

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