JEE Main 2026 Physics question
A car moving with a speed of 54 km/h takes a turn of radius 20 m. A simple pendulum is suspended from the ceiling of the car. Determine the angle made by the string of the pendulum with the vertical during the turning. (Take g = 10 m/s²)
Answer: (C)
Solution
v=54 km/h=15 m/s, so the centripetal acceleration is a=v²/R=225/20=11.25 m/s². In the car's frame, tanθ=a/g=1.125.