11 A ball is thrown vertically upwards from a ledge 1.45 m above the ground. The height, h metres, of the ball above the ground at / seconds can be modelled by the equation h = at² + bt+c. a State the value of c. F The ball reaches its highest point above the ground when f= 1.4 seconds and hits the ground after a further 1.5 seconds. bi Write down two equations in a and b. ii Hence find the values of a and b. c Find the times when the ball is 5 m above the ground. TI

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