Unreasonable Results

(a) What is the initial acceleration of a rocket that has a mass of 1.50 × 10⁶ kg at takeoff, the engines of which produce a thrust of 2.00 x 10⁶ N? Do not neglect gravity.

(b) What is unreasonable about the result? (This result has been unintentionally achieved by several real rockets.) 

(c) Which premise is unreasonable, or which premises are inconsistent? (You may find it useful to compare this problem to the rocket problem earlier in this section.)