86 A particle of mass m is thrown at t 0 with kinetic energy K at an angle 30 with the horizontal from the top of a tower of

Question

86 A particle of mass m is thrown at t 0 with kinetic energy K at an angle 30 with the horizontal from the top of a tower of height 80 m The particle again has kinetic energy K after time to The to is equal to 1 2Ko mg Ko 3 2mg 2 4 Ko mg Ko V4mg

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