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:
        Are average velocity and average speed always equal?
10 years ago

Answers : (1)

AskIITians Expert Hari Shankar IITD
17 Points
							


Average speed and average velocity are not the same quantity, and they are calculated differently. This is not just because velocity is a vector and speed is not; it has to do with distance and displacement.


Average Speed

Average speed is not a vector quantity. It has no direction.
The simplest way to find average speed is to divide the total distance travelled by the total time taken.

Average Velocity

Average velocity is based on where she ended her trip; specifically, how far she is from her starting point. This distance from the starting point is called displacement, and it's a vector quantity.

Example

Lets say Shyam moves 5 m to his left and then moves 2 m to the right. Also, say he takes 2 seconds to do this.

Distance travelled by Shyam = 5+2 m = 7m

Time taken = 2 s

Hence, average speed = total distance/time = 7/2 = 3.5 m/s

But displacement of Shyam is not 7m. Displacement is the difference in the initial and final positions, and it also has direction. Displacement of Shyam is 3 m to the left, because in the end, he is 5-2 m = 3 m to the left of the position from where he started. And it is important to mention the direction when speaking about displacement. So it is important that displacement is 3 m to the left

Time taken = 2s

Average velocity = displacement/time = 3m left / 2 = 1.5 m/s to the left. Since velocity is also a vector, it is important to mention direction here also.



10 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies


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

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


Ask Experts

Have any Question? Ask Experts

Post Question

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