Q. A body is moving with velocity 30 m/s towards east. After 10 seconds its velocity becomes 40 m/s towards north. The average acceleration of the body is
A) 5 m/s²
B) 1 m/s²
C) 7 m/s²
D) √7 m/s²
Explanation
[Solution from source] The velocity changes from 30 m/s east to 40 m/s north; the change Δv has magnitude √(30² + 40²) = 50 m/s. Average acceleration = 50/10 = 5 m/s². Taking the difference of speeds (1 m/s²) ignores the change in direction. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.