A body of mass 1 kg is thrown upwards with a velocity 20 m/s. It momentarily comes to rest after attaining a height of 18 m. How much energy is lost due to air friction? (g = 10 m/s2)

Question

A body of mass 1 kg is thrown upwards with a velocity 20 m/s. It momentarily comes to rest after attaining a height of 18 m. How much energy is lost due to air friction? (g = 10 m/s2) (A) 30 J (B) 40 J (C) 10 J (D) 20 J

Tardigrade Admin · Accepted Answer

Loss of energy =(1/2) mv 2- mgh =20 J

Q. A body of mass $1 k g$ is thrown upwards with a velocity $20 m / s .$ It momentarily comes to rest after attaining a height of $18 m .$ How much energy is lost due to air friction? $(g = 10 m / s^{2})$

30 J

40 J

10 J

20 J

Loss of energy $= \frac{1}{2} m v^{2} - m g h = 20 J$

Q. A body of mass 1kg is thrown upwards with a velocity 20m/s. It momentarily comes to rest after attaining a height of 18m. How much energy is lost due to air friction? (g=10m/s2)