Question

A bullet Fired Into a Trunk Loses 1/4 th of its kinetic energy in travelling 5cm. Before Stopping It travels a Further Distance of
a)150cm
b)1.5cm
c)1.25cm
d)15cm

Answer 1

Explanation:

ANSWER

2as=v

2

−u

2

2×a×5=v

2

−u

2

⇒2×a×5=

4

3

u

2

−u

2

⇒a=

40

−u

2

After 5 cm it loses

4

1

th

of its initial KE.

The acceleration will be same throughout.

Again using 2as=v

2

−u

2

when v becomes 0.

2×

40

−1

u

2

×s=−u

2

⇒s=20

So bullet further travels 15 m.

Answer 2

Answer:

I THINK IT IS OPTION (B)

Explanation:

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