Mechanics> UNBALANCED FORCES!!!...
a truck of mass 1000 kg is moving with a constant vel. .......a force acts on it so that a retardation of 4 m/s2
is produced ..........................find the unbalanced force on the truck
PLS EXPLAIN!!!!!!!!!!!!!!!
1 AnswersSince retardation(-a) is happeing therefore, final vel. is zero and let initial vel. be u....
now, v=u+at
(0=u-at) or (u=at) .................. (1)
we know that rate of change of momemtum is force applied.
therefore, (m2v2)- (m1v1)/t = F
(where t= time in which truck comes in rest and F = unbalanced force applied, also final momentum is 0)
now,
(0-mu)/t = F
from (1),
-mat/t = F
-ma = F
F = -ma
F= -1000*4
F= -4000N
this is your answer!
plz approve!!
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