## Answers

ay ay We know that Diameter of wheel = 30cm. 2 Radius = Amplitude 15 cm.

A-15 Period 30 sec. 30 b 20 30 Et 15 The centre of wheel is 18 cm aboue the Hoor. So, d=18. Take Cosine . As casine pattern is upside down.

So, f(x) = 15 cos (TX)+ 18

ist Graph in 35 (45,33) 75,33) 30 25 midline 20 MN ✓ at 18cm 15 10 5 (0,3) (30,3) 760,3) 5 10 22 25 30 35 yo 55 bo 65 70 75 so all Ginen that x=20 sec. then, f(20)= f (20)= -15 cas (3) + is cos (UF) + 18 705 - 5 * 1 /8 25.5 cm, 9101 After 20 sec height of rider = of midler = 25.5 cm

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