R P Goyal and S P Tripathi Solutions for Chapter: Laws of Motion, Exercise 5: EXERCISE–3(E)

A body falls from the top of a building and reaches the ground $2.5 \mathrm{s}$ later. How high is the building?( $\mathrm{g}=9.8 {\mathrm{ms}}^{-2}$)

A ball is thrown vertically upwards with an initial velocity of $49 {\mathrm{ms}}^{-1}$. Calculate the maximum height gained. ( $\mathrm{g}=9.8 {\mathrm{ms}}^{-2}$)

A ball is thrown vertically upwards with an initial velocity of $49 {\mathrm{ms}}^{-1}$. Calculate the time taken by it before it reaches the ground again. ( $\mathrm{g}=9.8 {\mathrm{ms}}^{-2}$)

A stone is dropped from the top of a tower and reaches the ground in $4 \mathrm{s}$. Taking $\mathrm{g}=10 {\mathrm{ms}}^{-2}$. Calculate the height of the tower

A pebble is dropped freely in a well from its top. it takes $20 \mathrm{s}$ for the pebble to reach the water surface in the well. Taking  $\mathrm{g}=10 {\mathrm{ms}}^{-2}$and speed of sound = $330 {\mathrm{ms}}^{\mathrm{\_}1}$, find the depth of the water surface.

A pebble is dropped freely in a well from its top. It takes $20 \mathrm{s}$ for the pebble to reach the water surface in the well. Taking $\mathrm{g}=10 {\mathrm{ms}}^{-2}$and speed of sound = $330 {\mathrm{ms}}^{\mathrm{\_}1}$, find the time taken when echo is heard after the pebble is dropped.

A ball is thrown vertically upwards from the top of a tower with an initial velocity of $19.6 {\mathrm{ms}}^{-1}$. The ball reaches the ground after $5 \mathrm{s}$. Calculate the height of the tower, ( take $\mathrm{g}= 9.8 {\mathrm{ms}}^{-2}$)

A ball is thrown vertically upwards from the top of a tower with an initial velocity of $19.6 {\mathrm{ms}}^{-1}$. The ball reaches the ground after $5 \mathrm{s}$. Calculate the velocity of the ball on reaching the ground ( take $\mathrm{g}= 9.8 {\mathrm{ms}}^{-2}$)