A classical mechanics problem by Anwar Arif
Classical Mechanics
Level
3
A particle of 5kg is released from 250m high and it enters 3.5m into the earth.find the net force(in N) applied to the particle by earth.The particle was primarily at rest.
15750
12250
3589
3549
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1 solution
in the air : V^2=Vo^2+2gS since; the particle was primarily at rest therefore; Vo =0 therefore; V^2=0+2 9.8 250=4900 therefore; V=70 m/s . in the earth : since; Vo=70 m/s and V=0 a=-a(deceleration"as it is inside the earth") therefore; 0=4900-2 a 3.5 therefore; a=700 m/s^2. F=m(a+g)=5(700+9.8)=3549 N