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Selina solutions
Grade 9 
Physics
Selina Solutions CONCISE subject class 9-ICSE-Physics
Chapter 3 Laws Of Motion
Exercise 3E
Question 43
Physics
Selina Solutions CONCISE subject class 9-ICSE-Physics
Chapter 3 Laws Of Motion
Exercise 3E
Question 43
Chapter 3 Laws Of Motion | Exercise 3E
Question 43
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 falls from the top of a building and reaches the ground 2.5s later. How high is the building? (Take g=9.8m/s^2)
Given: g=9.8m/s^2, t=2.5s
Assume ‘h’ to be the height of the building
We know from the equation of motion,
\begin{array}{l} \mathrm{H}=\mathrm{ut}+1 / 2 \mathrm{gt}^{2} \\ \Rightarrow \mathrm{H}=1 / 2 \mathrm{gt}^{2} \\ \Rightarrow \mathrm{H}=1 / 2(9.8)(2.5)^{2} \\ \Rightarrow 30.6 \mathrm{m} \end{array}
Question 43
A body falls from the top of a building and reaches the ground 2.5s later. How high is the building? (Take g=9.8m/s^2)
Given: g=9.8m/s^2, t=2.5s
Assume ‘h’ to be the height of the building
We know from the equation of motion,
\begin{array}{l} \mathrm{H}=\mathrm{ut}+1 / 2 \mathrm{gt}^{2} \\ \Rightarrow \mathrm{H}=1 / 2 \mathrm{gt}^{2} \\ \Rightarrow \mathrm{H}=1 / 2(9.8)(2.5)^{2} \\ \Rightarrow 30.6 \mathrm{m} \end{array}
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