×

#### Thank you for registering.

One of our academic counsellors will contact you within 1 working day.

Click to Chat

1800-1023-196

+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 bag of sand of mass 2 kg is suspended by a rope. A bullet of mass 10g is fired at it and gets embedded into it. The bag rises up a vertical height of 10 cm. The initial velocity of the bullet is nearly- a) 70 m/s b) 140 m/s c) 210 m/s d) 280 m/s
A bag of sand of mass 2 kg is suspended by a rope. A bullet of mass 10g is fired at it and gets embedded into it. The bag rises up a vertical height of 10 cm. The initial velocity of the bullet is nearly- a) 70 m/sb) 140 m/sc) 210 m/sd) 280 m/s

```
2 years ago

Agrata Singh
208 Points
```							  Writing energy conservation for the system just before collision and when the bag reaches height of 10 cmEinitial= 1/2x0.01v2( only the bullet had kinetic energy)Efinal=(2+0.01)x0.1x10 (potential energy of bag+bullet at height 10 cm)Upon solving Einitial=Efinal you will get     V2=402v=20(approx)
```
2 years ago
Suraj
13 Points
```							By conservation of energy,1/2mv^2=mgh (m gets cancelled) 1/2v^2= 10 × 0.01 (Taking g=10m/s^2, h=0.01m V=√0.2-------------1 By conservation of momentum, Mass of bullet × velocity of bullet = (Mass of bullet +mass of bag) × velocity of bag 0.01kg × velocity of bullet = (0.01 + 2) × √0.2 Velocity of bullet= 2.75/0.01                                = 280(approx)
```
2 years ago
Think You Can Provide A Better Answer ?

## Other Related Questions on Mechanics

View all Questions »

### Course Features

• 101 Video Lectures
• Revision Notes
• Previous Year Papers
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Test paper with Video Solution

### Course Features

• 110 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions