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Q4.9: NCERT Physics - Part 1 LAWS OF MOTION 4.9 Solution: A rocket with a lift-off mass 20,000 kg is blasted upwards with …
⚠️ Common Exam Traps & Conceptual Pitfalls
Students often calculate only the net force ($ma$) or forget to add the weight ($mg$) when determining the total thrust required for upward acceleration. Always apply Newton's second law as $F_{\text{thrust}} - mg = ma$ to ensure the engine force overcomes gravity while providing the specified acceleration.
A rocket with a lift-off mass 20,000 kg is blasted upwards with an initial acceleration of 5.0 m s__. Calculate the initial thrust (force) of the blast.
Step-by-Step Verified Solution
**Answer:** Thrust = 3.0 _ 10_ N
**Step-by-Step Explanation:**
Using Newton's second law for upward motion:
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