First slide

Instantaneous acceleration

Question

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.

Easy

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

Solution

While ascent $t_{a} = \frac{U}{g + a}$ a is retardation due to air resistance.
While descent $t_{d} = \sqrt{\frac{2 h}{g - a}}$

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