Tamil Nadu Board Solutions for Chapter: Force and Motion, Exercise 1: Evaluation

What do you mean by constant acceleration?

What is the centre of gravity?

Explain the types of stability with suitable examples.

Write about the experiment to find the centre of gravity of the irregularly shaped plate.

Geetha takes $15$ minutes from her house to reach her school on a bicycle. If the bicycle has a speed of $2$ $\raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{s}$}\right.$, calculate the distance between her house and the school.

A car started from rest and travelling with a velocity of $20 \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{s}$}\right.$ in $10 \mathrm{s}$. What is its acceleration?

A bus can accelerate with an acceleration $1 \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{${\mathrm{s}}^2$}\right.$. Find the minimum time for the bus to reach the speed of $100 \mathrm{km}/\mathrm{s}$ from $50 \mathrm{km}/\mathrm{s}$.

Note: This question given in the book seems to have errors and the modified question should be as given below.

A bus can accelerate with an acceleration $1 \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{${\mathrm{s}}^2$}\right.$. Find the minimum time for the bus to reach the speed of $100 \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{s}$}\right.$ from $50 \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{s}$}\right.$.

Fill in the boxes.