A body of mass 1 kg is thrown upwards with a velocity 20 m s-1. It momentarily comes to rest after attaining a height of 18 m. How much energy is lost due to air friction? (Take g= 10ms-2 ) (AIPMT 2009)
A. 20 J
B. 30 J
C. 40 J
D. 10 J
Answer:A
A body of mass 1 kg is thrown upwards with a velocity 20 m s-1. It momentarily comes to rest after attaining a height of 18 m. How much energy is lost due to air friction? (Take g= 10ms-2 ) (AIPMT 2009)
A. 20 J B. 30 J C. 40 J D. 10 J