Question

A particle of mass m is projected from the surface of earth with a speed v₀ (v₀< escape velocity). The speed of particle at height h = R (radius of earth) is : (Here, R = 6400 km and g = 9.8 m/s²)

• A.
• B.
• C.
• D. None of these

Answer 1

Answer: (C)

Answer 2

Total mechanical energy conservation T.E_i = T.E_ƒ

– $\frac { 1 } { 2 }$ $\frac { 1 } { 2 }$mv²

v =