Click to Chat

1800-2000-838

+91-120-4616500

CART 0

• 0

MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
```        A bullet of mass 20g moving horizontally at a speed of 300m/s is fired into a wooden block of mass 500g suspended by a long string. the bullet crosses the block and emerges on the other side. if the centre of the mass of the block rises by 20cm, find the speed of the bullet as it emerges from the block.
(while conserving energy in the last step r we supposed to equate the potential energey possessed by the block and the K.E. imparted to it. bcoz i think both the energies should be equated with the KE. of the bullet but i didn't get the answer through that method. plz help by providing the sol. , if poss, and with suitable explanation)```
7 years ago

Aniket Patra
48 Points
```										The potential energy of the block is equal to the difference between the initial and final kinetic energies of the bullet..Solve and get the answer..
```
7 years ago
510 Points
```
Mass of bullet = M = 20gm = 0.02kg.

Mass of wooden block M = 500gm = 0.5kg

Velocity of the bullet with which it strikes u = 300 m/sec.

Let the bullet emerges out with velocity V and the velocity of block = V'

As per law of conservation of momentum.

mu = Mv' +mu            .........(1)

Again applying work – energy principle for the block after the collision,

0 – (1/2) M × v'2 =-

Mgh (where h = 0.2m)

v'2 = 2gh

V' = (2gh)1/2 = 2m/s

Substituting the value of V' in the equation (1), we get\

0.02 × 300 = 0.5 × 2 + 0.2 × v

v= 250m/sec.

approve if u like my ans

```
7 years ago
RAHUL GAUR
17 Points
```										equate the kinetic energy of the bullet after emerging from the block and potential  energy of the block at 20 cm to initial kinetic energy.........
```
7 years ago
Think You Can Provide A Better Answer ?

## Other Related Questions on Mechanics

View all Questions »
• Complete Physics Course - Class 12
• OFFERED PRICE: Rs. 2,756
• View Details
• Complete Physics Course - Class 11
• OFFERED PRICE: Rs. 2,968
• View Details