Q. A body, under the action of a force F⃗ = 6î − 8ĵ + 10k̂, acquires an acceleration of 1 m/s². The mass of this body must be:
A) 10 kg
B) 20 kg
C) 10√2 kg
D) 2√10 kg
Explanation
[Solution from source] |F| = √(6² + 8² + 10²) = √200 = 10√2 N. With a = 1 m/s², m = F/a = 10√2 kg. Simply adding the components or taking 2√10 is a mistake in the magnitude. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.