STANDARD Physics Newton's Second Law MCQ Question
A rocket with a lift-off mass 2 × 10⁴ kg is blasted upwards with an initial acceleration of 5 m s⁻². The initial thrust of the blast is (Take g = 10 m s⁻²)
2 × 10⁵ N
4 × 10⁵ N
3 × 10⁵ N
5 × 10⁵ N
Correct Answer
Detailed Explanation
The initial thrust is the sum of the force required to overcome gravitational pull and the force required to provide the given acceleration. Using F = m(a + g), we calculate F = (2 × 10⁴ kg)(5 + 10) m s⁻² = 3 × 10⁵ N.
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