Time of flight of an object projected with speed 20 ,ms ^{-1} at an angle 30^{circ} with horizontal,

English

Gujarati

Hindi

3-2.Motion in Plane

easy

The time of flight of an object projected with speed $20 \,ms ^{-1}$ at an angle $30^{\circ}$ with the horizontal, is .... $s$

A

$1$

B

$4$

C

$2$

D

$6$

Solution

(c)

$T =\frac{2 v \sin \theta}{g}$

$=\frac{2 \times 20 \times \sin 30^{\circ}}{1 \phi}$

$2 \times 2 \times \frac{1}{2}=2$

Standard 11

Physics

Share

Similar Questions

A projectile $A$ is thrown at an angle $30^{\circ}$ to the horizontal from point $P$. At the same time another projectile $B$ is thrown with velocity $v_2$ upwards from the point $Q$ vertically below the highest point $A$ would reach. For $B$ to collide with $A$, the ratio $\frac{v_2}{v_1}$ should be

medium

FIgure shows a sphere of mass $500\ g$ moving in a steady flow of air in the $x- $ direction. The air-stream exerts an essentially constant force of $0.9\ N$ on the sphere in the $x-$ direction. If at $t = 0$ the sphere is moving a s shown in the figure, determine the time required for the sphere to cross the $y-$ axis again …….. $\sec$

normal

A projectile is thrown at an angle $\theta$ such that it is just able to cross a vertical wall at its highest point as shown in the figure.The angle $\theta$ at which the projectile is thrown is given by

medium

A projectile crosses two walls of equal height $H$ symmetrically as shown If the horizontal distance between the two walls is $d = 120\,\, m$, then the range of the projectile is …….. $m$

hard

A cricketer can throw a ball to a maximum horizontal distance of $100\, m$. The speed with which he throws the ball is ……… $ms^{-1}$ (to the nearest integer)

easy