A bullet of mass 10 ~g is fired horizontally with a velocity 1000 ~ms ⁻¹ from a rifle situated at a height 50 ~m above the ground. If the bullet reaches the ground with a velocity 500 ~ms ⁻¹ , the work done against air resistance in the tra

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A bullet of mass 10 ~g is fired horizontally with a velocity 1000 ~ms ⁻¹ from a rifle situated at a height 50 ~m above the ground. If the bullet reaches the ground with a velocity 500 ~ms ⁻¹ , the work done against air resistance in the trajectory of the bullet is : (g=10 ~ms ⁻² )

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Correct answer: C. 3750 ~J

From equation of motion, v^2=u^2-2 a s(500)^2=(1000)^2-2 a ss= (1000)^2-(500)^2 2 a = 375000 a Work done against air resistance =F S=m a s= 10 1000 a 375000 a =3750 ~J

A bullet of mass 10 ~g is fired horizontally with a velocity 1000 ~ms ⁻¹ from a rifle situated at a height 50 ~m above the ground. If the bullet reaches the ground with a velocity 500 ~ms ⁻¹ , the work done against air resistance in the trajectory of the bullet is : (g=10 ~ms ⁻² )

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