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A body of mass 500g is thrown upwards with a velocity 20 m/s and reaches back tothe surface of a planet after 20 sec then the weight of the body on the planet is1.2N42.4N3.5 N4. 1 N |
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Answer» 4.Tine of ascent = Time of descentThus, time of ascent, t = 20/2 = 10 secLet the acceleration due to gravity on the planet is g'.then, by using v = u + at0 = 20 - (g' X 10) (as u = 20 m/s and t = 10s and direction of g' is opposite to that of u)g' = 2 m/s^2Thus, weight of the body = mg' = 0.5kg X 2 m/s^2 = 1 kgm/s^2 = 1N |
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