A web page designer creates an animation in which a dot on a computer screen has

Question

A web page designer creates an animation in which a dot on a computer screen has a position of r_vec = [ 4.5 cm + ( 2.7 cm/s^2 ) t^2] hat{ i } + ( 4.7 cm/s )that{ j } .

A.Find the average velocity of the dot between t = 0 and t = 2.0 s .
Give your answer as a pair of components separated by a comma. For example, if you think the x component is 3 and the y component is 4, then you should enter 3,4. Express your answer using two significant figures.

B.Find the instantaneous velocity at t = 0s.
Give your answer as a pair of components separated by a comma. For example, if you think the x component is 3 and the y component is 4, then you should enter 3,4. Express your answer using two significant figures.

C.Find the instantaneous velocity at t = 1.0s
Give your answer as a pair of components separated by a comma. For example, if you think the x component is 3 and the y component is 4, then you should enter 3,4. Express your answer using two significant figures.

D.Find the instantaneous velocity at t = 2.0s
Give your answer as a pair of components separated by a comma. For example, if you think the x component is 3 and the y component is 4, then you should enter 3,4. Express your answer using two significant figures.

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