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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
An aircraft is moving with a velocity of $300\,m{s^{ - 1}}.$ If all the forces acting on it are balanced, then
  • ✓
    It still moves with the same velocity
  • B
    It will be just floating at the same point in space
  • C
    It will fall down instantaneously
  • D
    It will lose its velocity gradually
✓

Answer

Correct option: A.
It still moves with the same velocity
a
$F = ma$

If the forces are balanced, $F=0$, which implies $a=0$. If there's no acceleration, then the velocity is constant. The solutions are trajectories of constant velocity, which means the aircraft will move along a straight line with uniform speed.

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