MCQ practice · SSC Physics Board questions · Chapter 3: Force
A force of 20 N is applied on a body of mass 20 kg. What will be the acceleration of the body?
Think it through first, then pick an option.
- a 400 m s⁻²
- b 40 m s⁻²
- c 20 m s⁻²
- d 1 m s⁻²
Answer and explanation
Correct answer: d 1 m s⁻²
a = F/m = 20/20 = 1 m s⁻².
Why the other options are wrong
- a 400 m s⁻²: 400 comes from multiplying mass and force; acceleration is a = F/m, a division.
- b 40 m s⁻²: 40 does not come from a = 20/20; acceleration is F divided by m.
- c 20 m s⁻²: 20 is the value of the force, not the acceleration; divide the force by the mass.
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