Question
a bullet fired into a target loses half its velocity after penetrating 25cm.How much further will it penetrate before coming to rest ?
Answers
MathMate
Kinetic energy, KE = (1/2)mv²
resistive force = constant
Retaining half the velocity means (1/2)^2=1/4 of the kinetic energy.
Since 50% of the KE penetrates 25 cm, so
25% of the (remaining) KE penetrates 12.5 cm.
resistive force = constant
Retaining half the velocity means (1/2)^2=1/4 of the kinetic energy.
Since 50% of the KE penetrates 25 cm, so
25% of the (remaining) KE penetrates 12.5 cm.
Sakshi
Good