Question

6. The Boy in the story 'The Boy who drew Cats' left the priest and reached the big temple in thenear by village. As the place was empty, he decided to wait for the priests. Write the diary entry ofthe Boy in that night..(20 minutes)

Answer 1

Answer:

Initially the bullet was at rest inside the barrel and attains a velocity/speed of 100 m/s. The mass given is m and kinetic energy is 100 J. We have to find the mass.

K.E. formula:-

= \boxed{ \rm{ \frac{1}{2} m( {v2}^{2} - {v1}^{2} )}}=

2

1

m(v2

2

−v1

2

)

Basically it's half of the product of its mass and change in velocity. By using this formula,

⇛ K.E = 1/2 m(v² - u²)

⇛ 100 = 1/2 × m × (100² - 0²)

⇛ 200 = 10000 m

⇛ m = 200/10000 kg

⇛ m = 0.020 kg / 20 g

Note:-

Since the units are already in S.I. unit, so I didn't bother having any unit conversion and directly used the S.I. of mass i.e. kg