need help on this please

25. Gallileo's free-fall formula. Galileo developed a formula for a body's velocity during free fall by rolling balls from rest down increasingly steep inclined planks and looking for a limiting formula that would predict the balls behavior when the plank was vertical and the ball fell freely; see part (a) of the accompanying figure. He found that, for any angle of the plank, the balls velocity t sec into motion was a constant multiple of t. That is, the velocity was given by the formula v = kt. The value of the constant & depended on the inclination of the plank. In modern notation-part (b) of the figure with distance in meters and time in seconds, what Galileo determined by experiment was that, for any given angle 0, the ball's velocity t sec into the roll was v = 9.8(sin 0)t m/sec. Free-fall position ? (a) (b) (a) What is the equation for the ball's velocity during free fall? (b) Based on your work in (a), what constant acceleration does a freely falling body experience near the surface of the earth