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Standard XII
Physics
Instantaneous Force and Impulse
A bullet of m...
Question
A bullet of mass 0.1 kg moving horizontally with a velocity of 20 m/s strikes a target and brought to rest in 0.1 s. Find the impulse and average force of impact.
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Solution
Initial momentum
P
i
=
m
u
=
0.1
×
20
=
2
k
g
m
/
s
Final momentum
P
f
=
0
Impulse
I
=
|
P
f
−
P
i
|
=
|
0
−
2
|
=
2
k
g
m
/
s
Average force
F
=
I
Δ
t
=
2
0.1
=
20
N
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