A stone is thrown vertically upward with an initial velocity of $40\, m/s$. Taking $g = 10 \,m/s^2$, find the maximum height reached by the stone. What is the net displacement and the total distance covered by the stone?

Why is it difficult to hold a school bag having a strap made of a thin and strong string?

Calculate the force of gravitation between the earth and the Sun, given that the mass of the earth $= 6 \times 10^{24}\, kg$ and of the Sun $= 2 \times 10^{30}\, kg$. The average distance between the two is $1.5 \times 10^{11}\, m$.

The earth and the moon are attracted to each other by gravitational force. Does the earth attract the moon with a force that is greater or smaller or the same as the force with which the moon attracts the earth? Why?

What is the magnitude of the gravitational force between the earth and a $1 \,kg$ object on its surface? (Mass of the earth is $6 \times 10^{24}\, kg$ and radius of the earth is $6.4 \times 10^6\, m$.)