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Byju's Answer
Standard XII
Physics
a-t Graph
Variation of ...
Question
Variation of force with time is given as in figure. If initial momentum of a of body is
10
k
g
m
s
−
1
then, its final momentum after
4
s
, will be
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Solution
We know that area under Force-time graph gives us change in momentum
⇒
A
=
Δ
p
Δ
p
=
1
2
×
4
×
4
=
8
k
g
m
/
s
So,
its final momentum after
4 s = Initial Momentum + Change in Momentum
⇒
Final Momentum
=
10
+
8
=
18
k
g
m
/
s
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