Notifications
Clear all
Motion
1
Posts
2
Users
0
Likes
251
Views
0
22/10/2021 7:03 pm
Topic starter
(a) Define velocity. What is the SI unit of velocity?
(b) What is the difference between speed and velocity?
(c) Convert a speed of 54 km/h into m/s.
1 Answer
0
22/10/2021 7:10 pm
(a) Velocity is defined as the distance travelled by the body in unit time in a given direction. The SI unit of velocity is m/s.
(b)(i) Speed is a scalar quantity whereas velocity is a vector quantity.
(ii) Speed of a body is distance travelled by it per unit time whereas velocity of a body is the distance travelled by it per unit time in a given direction.
(iii) Speed is always positive whereas velocity can be both positive as well as negative.
(c) Meters in 1 km = 1000
M in 54 km = 54000
Second in one hour = 60 x 60= 3600
54km in m/sec = \(\frac{54000}{3600}\)
= 15 m/sec
This post was modified 4 years ago by Mayank1444