A bullet is fired into a block. Its kinetic energy reduces by 50% in penetrating through 9 cm. What is the total distance penetrated by the bullet?

Q: A bullet is fired into a block. Its kinetic energy reduces by 50% in penetrating through 9 cm. What is the total distance penetrated by the bullet?

(a) 10 cm

(b) 12 cm

(c) 15 cm

(d) 18 cm

Ans: (d)