A bullet of mass 100g moving with 20 m/s strikes a wooden plank and penetrates upto 20cm . Calculate the resistance offered by wooden plank
Answers
Answered by
17
Resistance offered-
F=ma ,where m=100g=0.1kg
accln is to be determined.
v2=u2+as
as bullet is stopped after 20 cm in plank
v=0 ,u=20m/s ,s=20cm=0.2m
On substituting 02=202+2a*0.2
a=-400/0.4
a=-1000 (- sign represents deceleration)
F=0.1*1000 (only magnitude of accln as we are not told to find F vector)
F=100N=Resistance offered by wooden plank
Similar questions