Lakhmir Singh Solutions Class 9 Physics Solutions for Exercise in Chapter 1 - Motion
Prev
a) Derive the formula: v = u + at where the symbols have usual meanings
b) A bus was moving with a speed of 54 km/h. On applying brakes it stopped in 8 seconds. Calculate the acceleration.
Answer:
a) Let u be the initial velocity of the body and v be the final velocity of the body. The body is accelerated uniformly with which is represented by a. The time taken is t. Therefore, the equation v = u + at.
Acceleration = change in velocity/time taken
a = (v-u)/t
at = v – u
v = u + at
b) Initial velocity, u = 54 km/h = 15 m/s
Final velocity, v = 0 m/s
Time, t = 8s
Acceleration, a = ?
a = (v-u)/t = -1.87 \mathrm{m/s^2}
Related Questions
Facebook
Whatsapp
Copy Link
Lido
Courses
Quick Links
Terms & Policies
Terms & Policies
Connect with us on social media!
2022 © Quality Tutorials Pvt Ltd All rights reserved