A ball tied to the end of a string of length 10cm is rotated with constant speed of 2m/s in a circle about the origin. Find the equation of projection of the ball on the x-axis. At t=0, the ball makes an angle of 45° with the x-axis & is travelling in anticlockwise direction.

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1.	A ball tied to the end of a string of length 10cm is rotated with constant speed of 2m/s in a circle about the origin. Find the equation of projection of the ball on the x-axis. At t=0, the ball makes an angle of 45° with the x-axis & is travelling in anticlockwise direction.
A.	0.1sin(20t + 3π/4)
B.	0.1cos(20t + π/4)
C.	10sin(20t + π/4)
D.	10cos(20t – 3π/4)
Answer» B. 0.1cos(20t + π/4)

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