a bullet of mass100gm moving with 20m/s strikes a wooden plank and penetrates upto20cm. calculate the resistance offered by the wooden plank??
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Here, m=100
=10 raised to power -1 kg .
v = 20m/s.
x = 20 cm
= 20/100m = 1/5 m,
f = ?
As work do e in stopping the bullet = K.E of bullet
Therefore, f(x) = 1/2 m(v raised to power 2)
f = 1/2 m (v raised to power 2 )/x
= 1/2 × ( 10 raised to power -1 )×(20 raised to power 2 ) divided by 1/5 =
= 100 N
=10 raised to power -1 kg .
v = 20m/s.
x = 20 cm
= 20/100m = 1/5 m,
f = ?
As work do e in stopping the bullet = K.E of bullet
Therefore, f(x) = 1/2 m(v raised to power 2)
f = 1/2 m (v raised to power 2 )/x
= 1/2 × ( 10 raised to power -1 )×(20 raised to power 2 ) divided by 1/5 =
= 100 N
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