Question

(18) If the frequency of an object in uniform circular motion is doubled, its acceleration becomes
(1) Two times
(2) Four times
(3) Half
(4) One fourth

(19) A body is moving on a circle of radius 80 m with a speed 20 m/s which is decreasing at the rate 5 m/s at an instant.The angle made by its acceleration with its velocity is
(1) 45°
(2) 90°
(3) 135
(4) 0°

(20) The distance of a particle moving on a circle of radius 12 m measured from a fixed point on the circle andmeasured
along the circle is given by s = 2t^3 (in meters). The ratio of its tangential to centripetal acceleration at t=2s is
(1) 1:1
(2) 1:2
(3) 2:1
(4) 3:1


please give me full explanation... please...​

Answer 1

Answer:

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