What is the velocity of the highest point of a rotating wheel of a car moving with a velocity of 20 m/s ?

A wheel is made to roll without slipping, towards right, by pulling a string wrapped around a coaxial spool as shown in figure. With what velocity the string should be pulled so that the centre of the wheel moves with a velocity of 3m//s ?

A motor car A is travelling with a velocity of 20m//s in the north-west direction and another motor car B is travelling with a velocity of 15m//s in the north-east directions.The magnitude of relative velocity of B with respect to A is.

A motor car A is travelling with a velocity of 20 m/s in the north-west direction and another motor car B is travelling with a velocity of 15 m/s in the north-east direction. The magnitude of relative velocity of B with respect to A is

Two particles move simultaneously from two points A and B, 300m apart. The particle at A, starts towards B with a velocity of 25 m//s and that at B, moves normal to the former with a velocity of 20 m//s

A car is going east wards with a velocity of 8m/s. To the passengers in the car, a train appears to be moving north wards with a velocity of 15 m/s. What is the actual velocity of the train:

What will be the minimum stopping distance required by a car to stop if it is moving with a velocity of 40m/s with a deceleration of 20m//s^(3) ? How much time will it take to stop the car?