# A body of mass  is thrown upwards with a velocity . It momentarily comes to rest after attaining a height of . How much energy is lost due to air friction in J is

## Question ID - 50908 :- A body of mass  is thrown upwards with a velocity . It momentarily comes to rest after attaining a height of . How much energy is lost due to air friction in J is

3537

Initial energy of body

A part of this energy consumes in doing work against gravitational force and remaining part consumes in doing work against air friction

i.e.,

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Ten years ago, the ages of the members of a joint family of 8 people added up to 231 years. Three years later, one member died at the age of 60 years and a child was born during the same year. After another three years, one more member died, again at 60, and a child was born during the same year. The current average of this eight-member joint family is nearest to

(a) 21 yrs.                    (b) 22 yrs.                 (c) 23 yrs.                 (d) 24 yrs.