A 20-M Long String Is Tied to a 3

Multiple Choice

A 2.0-m long string is tied to a 3.0-kg rock and the rock is twirled around in a circle at a constant speed.The speed of the rock is such that the string makes an angle of 45 degrees with the horizontal.How long does it take the rock to complete one full circle?

A) 1.3 s
B) 1.9 s
C) 2.4 s
D) 2.8 s
E) 4.4 s