IB Physics-Theme A-Paper2-Circular motion-Qc#1-Relative velocity and work

Aibhe and Euan are sitting on opposite sides of a merry-go-round, which is
rotating at constant speed around a fixed centre. The diagram below shows the view from above. Aibhe is moving at speed 1.0ms relative to the ground.
Determine the magnitude of the velocity of Aibhe relative to
(i) Euan.
(ii) the centre of the merry-go-round.
b).. (i) Outline why Aibhe is accelerating even though she is moving at
constant speed.
(ii) Draw an arrow on the diagram on page 22 to show the direction in which Aibhe. Explain why Aibhe feels as if her upper body is being “thrown outwards”, away from the centre of the merry-go-round is accelerating.
(iii) Identify the force that is causing Aibhe to move in a circle.
(iv) The diagram below shows a side view of Aibhe and Euan on the merry-go round.
c ) . Euan is rotating on a merry-go-round and drags his foot along the
ground to act as a brake. The merry-go-round comes to a stop after 4.0
rotations. The radius of the merry-go-round is 1.5 m. The average frictional force between his foot and the ground is 45 N. Calculate the work done.
Topic 6 -Circular motion-Playlist