1 – The ball is thrown horizontally with initial velocity Vx =9.8 m/s. Find when and where its normal acceleration is twice greater than the tangential one.

2- A wheel of radius 50 cm accelerates uniformly from a frequency of 4 Hz to 6 Hz during
50 revolutions. What are its angular acceleration and a period of time for this frequency
change? Find the tangential and normal accelerations at the beginning and the end of this
period of time.