alleryA rocket of mass 5000 kg accelerates upward at 4 m/s². Taking g = 10 m/s², the THRUST (upward force) from the rocket engines must equal:
A50,000 N
B20,000 N
C70,000 N
D100,000 N
Answer & Solution
Correct answer: C. 70,000 N
Net upward force = thrust − weight = ma.
Weight = mg = 5000 × 10 = 50,000 N (down).
Required net force for upward 4 m/s² = ma = 5000 × 4 = 20,000 N. So thrust = weight + net force = 50,000 + 20,000 = 70,000 N.
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