1. A tower is 500 m tall. A ball is thrown downward at an initial velocity of 2 m/s. The height of the ball (measured in metres) above the ground after t seconds is given by the formula h=500-2t-5t². (round off answers to 1 decimal place if necessary) a) Find the velocity of the ball after 3 seconds. b) Find the acceleration of the ball after 5 seconds.

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