Question

3 grooves AB,AC and AD are made in a circular disk lying in a vertical plane 3 particles B,C and D constrained to move along path AB,AC and AD respectively are released from point A.Particle B reaches point B in time tB,particle C reaches point C in time tC and particle D reaches at point D in time tD.Then which of the following statements is incorrect

Answer 1

\[t_{B}=t_{C}=t_{D}\]
\[t_{B}>t_{C}=t_{D}\]
\[t_{C}>t_{B}>t_{D}\]
\[t_{D}=t_{B}>t_{C}\]

Answer 2

is point a the center of the disk?

Answer 3

the figure is like this one