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4.1 , newtons laws of motion — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics4.1 , newtons laws of motion1 Mark
MCQ
A rocket with a lift- off mass $3.5 \times {10^4}$$kg$ is blasted upwards with an initial acceleration of $10m/{s^2}.$ Then the initial thrust of the blast is
  • A
    $1.75 \times {10^5}N$
  • B
    $3.5 \times {10^5}N$
  • ✓
    $7.0 \times {10^5}N$
  • D
    $14.0 \times {10^5}N$
✓

Answer

Correct option: C.
$7.0 \times {10^5}N$
c
(c) Initial thrust must be

$m\,[g + a] = 3.5 \times {10^4}(10 + 10) = 7 \times {10^5}N$

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