exam Maths Puzzle Numerical Ability

A horse runs through an arc of 40 degrees along a circular racetrack. How far will the horse run if the diameter of the racetrack is 3000 ft. ?

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I would like to know how can i compute the query that listed in the exercise 4.4 1 in the text book with the above ISBN. The acceleration of a particle is given by a= -9sin3t cms^-2. if the initial velocity is 5 cms^-1 and the particle is 3cm to the left of the origin, find the exact displacement aft