Statement A : In the presence of heavy air resistance, the time of descent is longer than the time of ascent and the final speed will be smaller than the initial speed for a projected body.Statement B : During ascent the air resistance and gravity act in the same direction while during descent they act in the opposite direction.
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a
Both A and B are true
b
Both A and B are false.
c
A is true , but B is false
d
A is false, but B is true
answer is A.
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Detailed Solution
While ascent ta=Ug+a (a is retardation due to air resistance)While descent td=2hg−a
Statement A : In the presence of heavy air resistance, the time of descent is longer than the time of ascent and the final speed will be smaller than the initial speed for a projected body.Statement B : During ascent the air resistance and gravity act in the same direction while during descent they act in the opposite direction.