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
Menu
Grade: 11
        A particle moves on a straight line in such a way it covers 1st half distance with speed 3m/s and next half distance in two equal time intervals with speed 4.5m/s and 7.5m/s respectively. Find average speed of the particle.
8 months ago

Answers : (1)

Arun
13919 Points
							
 

let total distance of path is S ...

 

 

 

for first half , time taken if t

 

speed = distance/time

 

3 = S/2t

 

t = S/6      .............1

 

 

 

for second half , time taken is T ...

 

for first  T/2 it moves with 4.5

 

speed = distance/time

 

4.5 = 2x/T

 

 x = 4.5T/2   ...........2

 

for second T/2 it moves with 7.5

 

7.5 = 2y/T

 

y = 7.5T/2       ..........3

 

we have , x+y = S/2so

 

(7.5+4.5)T = S/2

 

T = S/24        ...............4

 

total time taken during its motion is T+t

 

 Ttotal = T+t = S/24+S/6 = 5S/24

 

total distance = S

 

average speed = total distance/total time = S/5S/24 = 24/5 = 4.8m/s

8 months ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies

Get Extra Rs. 1,590 off

COUPON CODE: SELF10


Course Features

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


Course Features

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


Get Extra Rs. 64 off

COUPON CODE: SELF10

Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!! Click Here for details