a )
F is the average force excerted by water on bullet
F X d X cos180 = 0.5 X m ( V22 - V12 )
F X 0.12 X ( -1 ) = 0.5 X 0.032 (02 - 3802 )
F X ( -0.12 ) = -2310.4
F = 19253.33 N
b )
the acceleration of the bullet a = - F / m
= - 19253.33 / 0.032
a = - 601666.66 m/s2
the time is = ( V2 - V1 ) / a
= ( 0 - 380 ) / ( - 601666.66 )
= 0.631 ms
and t = 2 h / g
t = ( 2 X 2 / 9. 8
t = 0.6388 sec
the total time is t = 0.631 X 10-3 + 0.6388
T = 0.6394 sec
A 32 g bullet is fired horizontally from a rifle at 380 m/s into a water...
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