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**A mass is tethered to a post and moves in a circular path of radius r=.35m**

on an air table -friction free- at a constant speed v=18m/s.

We employ the coordinate system ( classic 2 dimension space).

If at t=0s the mass is at θ=0

a-what is the coordinates(x,y) of the mass at t=0.1s?

b-what is thye acceleration vector at t=0s?

c-what is the acceleration vector of the mass when θ=90

on an air table -friction free- at a constant speed v=18m/s.

We employ the coordinate system ( classic 2 dimension space).

If at t=0s the mass is at θ=0

^{o},a-what is the coordinates(x,y) of the mass at t=0.1s?

b-what is thye acceleration vector at t=0s?

c-what is the acceleration vector of the mass when θ=90

^{o}?Can someone help meI have noo idea!

the testbook give those answer

a-(0.15m,-0.32m)

b-(-9.3*10

^{2}m/s

^{2})

**i**

c-(-9.3*10

^{2}m/s

^{2})

**j**

But first, i need to understand what is going on in the problem.

Thank you for your help