A0.30 kg mass is attached to a long string and resolves clockwise ( looking down from the top) in a horizontal circle of radius 0.10 m with a speed of 0.50 m/s and a period of 1.3 s.

a) determine the ceptipetal acceleration of the mass.

There is no requirement of Time period if u r given the rest data.
Centripetal force(F) = mv²/r.
where m is mass of body , v is the speed , and r is the radius of the path.
=> F =( 0.30×0.50×0.50)/0.10 = 0.75 m/s².
Its direction is radially inwards.
Hope it helps!!!

The best answer is (a) which is universal law is in effect at all times. it is constantly at play in everything we do and governs our lives. it is also important to note that universal law applies to not only everything on earth, but everything in the universe as well, which is another reason why it is in effect at all times.