Question

A particle travels with constant speed on a circle of radius 3 metre and completes one revolution

in 20 second. Starting from origin O, find the magnitude and direction of displacement vector 5 second later –

• A. 4.2 m at an angle of 45° with x-axis
• B. 5.54 m at an angle of 67.5⁰ with x-axis
• C. 6 m at an angle of 90⁰ with x-axis
• D. 5 m at an angle of 60⁰ with x-axis

Answer 1

Answer: (A)

4.2 m at an angle of 45° with x-axis

Answer 2

After 5 sec. particle will cover 1/4 revolution and it will reach at point B.)

\ Displacement = $\sqrt{2}$R = 3$\sqrt{2}$m = 4.2 m