61. When a body falls in air, the resistance of air depends to a great extent on the shape of the body, 3 different shapes are given. Identify the combination of air resistances which truly represents the physical situation. (The cross sectional areas are the same).
(a) 1 < 2 < 3 (b) 2 < 3 < 1
(c) 3 < 2 < 1 (d) 3 < 1 < 2
Explanation- (c) A stream lined body has less resistance due to air.
(17)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (124)