Motion Test - 5...

The ratio of magnitude of velocity of projection in the upward motion to the magnitude of velocity of the body on reaching the point of projection in its downward motion is_____ .

An automobile travelling with the speed of $$\displaystyle 72\ km {h}^{-1} $$ can be stopped within a distance of $$20\ m$$, by applying brakes. Determine the retardation.

In the above shown figure, the velocity

Tripling the speed of a motor car multiplies the distance needed for stopping it by

A displacement-time graph of a body moving with uniform velocity is shown in the figure. Find out its velocity and its displacement at the end of 5 seconds.

A ball is thrown vertically upwards from the top of a tower with a velocity of $$\displaystyle { 10\quad ms }^{ -1 }$$. The ball reaches the ground with the velocity $$\displaystyle { 30\quad ms }^{ -1 }$$. What is the height of the tower? $$\displaystyle (Take \quad g ={ 10\quad ms }^{ -2 })$$

A body whose speed in a particular direction is constant

Figure  shows the displacement-time graphs (a) and (b) for a body moving in a straight path drawn on the same scales. Then the velocity in case of (b) is

Two bodies of different masses $$ {m} _ {1}$$ and $$ {m} _ {2}$$ are dropped from two different heights $${h} _ {1}$$ and $$ {h} _ {2}$$. What is the ratio of time taken by the two to reach the ground?

When brakes are applied the velocity of a car changes from $$\displaystyle { 30\ ms }^{ -1 } to\ { 10\ ms }^{ -1 }$$ in 5 s. The acceleration produced in it is ____ $$\displaystyle { ms }^{ -2 }$$.