A bike starts from rest and accelerates to a speed of 15 m/s over the course of 5 seconds. The average acceleration of the
bike is m/s2

Aperson stands on a platform, initially at rest, that can rotate freely without friction. the moment of inertia of the person plus the platform is ip. the person holds a spinning bicycle wheel with its axis horizontal. the wheel has moment of inertia iw and angular velocity ωw. take the ωw direction counterclockwise when viewed from above. part a what will be the angular velocity ωp of the platform if the person moves the axis of the wheel so that it points vertically upward?

It is really hard for me right know

What is the relationship between the direction of motion of the balloon and the wind currents