Q. A particle has initial velocity (2î + 3ĵ) and acceleration (0.3î + 0.2ĵ). The magnitude of velocity after 10 seconds will be
A) 9 units
B) 9√2 units
C) 5√2 units
D) 5 units
Explanation
[Solution from source] v = u + at = (2 + 0.3 × 10)î + (3 + 0.2 × 10)ĵ = 5î + 5ĵ. Magnitude = √(25 + 25) = 5√2 units. Adding the components as scalars (5 + 5 or 9) is the trap. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.