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Soumo Sarkar Correct answer is (2) i.e 3 x 10^5 NUpvote·0· Reply ·2014-05-21 19:42:32
A rocket with a lift-off mass 20,000 kg is blasted upwards with a an initial acceleration of 5 m/s^2 .Calculate:- the initial force of the blast :-
1) 1 x 10^5 N
2) 3 x 10^5 N
3) 2 x 10^5 N
4) 4 x 10^5 N
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4 Answers
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283Mass of the rocket, m = 20,000 kg
Initial acceleration, a = 5 m/s2
Acceleration due to gravity, g = 10 m/s2
Using Newton’s second law of motion, the net force (thrust) acting on the rocket is given by the relation:
F – mg = ma
F = m (g + a)
= 20000 × (10 + 5)
= 20000 × 15 = 3 × 105 N
1The answer is
1)1 x 10^5 N
- Soumo Sarkar Correct answer is (2) i.e 3 x 10^5 N
3Correct answer is (2) i.e 3 x 10^5 N
But can anyone please explain how ?