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Selina solutions
Grade 9 
Physics
Selina Solutions CONCISE subject class 9-ICSE-Physics
Chapter 2 Motion In One Dimension
Exercise 2A
Question 41
Physics
Selina Solutions CONCISE subject class 9-ICSE-Physics
Chapter 2 Motion In One Dimension
Exercise 2A
Question 41
Chapter 2 Motion In One Dimension | Exercise 2A
Question 41
CHAPTERS
1. Chapter 1 – Measurements and Experimentation
2. Chapter 2 Motion In One Dimension
4. Chapter 4 Pressure In Fluids And Atmospheric Pressure
5. Chapter 5 Upthrust In Fluids Archimedes Principle And Floatation
7. Chapter 7 Reflection Of Light
8. Chapter 8 Propogation Of Sound Waves
A body is moving vertically upwards. Its velocity changes at a constant rate from 50 m/s to 20 m/s in 3s. What is its acceleration?
Given: u=50m/s; v=20m/s, t=3s
\text { Acceleration }=\frac{v-u}{t}=\frac{-30}{3}=-10 \mathrm{m} / \mathrm{s}^{2}
The negative sign indicates velocity decreases with time, hence retardation is 10m/s^2.
Question 41
A body is moving vertically upwards. Its velocity changes at a constant rate from 50 m/s to 20 m/s in 3s. What is its acceleration?
Given: u=50m/s; v=20m/s, t=3s
\text { Acceleration }=\frac{v-u}{t}=\frac{-30}{3}=-10 \mathrm{m} / \mathrm{s}^{2}
The negative sign indicates velocity decreases with time, hence retardation is 10m/s^2.
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