Oblique Collision

Q.

A body is thrown horizontally from the top of a tower and strikes the ground after three seconds at an angle of ${45}^{\circ }$ with the horizontal. Find the height of the tower and the speed with which the body was projected. Take $g=9.8m/s^2$

1. 29.4 m/s

2. 24.2 m/s

3. 22.2m/s

4. 17 m/s

Q.

A cannon ball is fired with a velocity 200 m/sec at an angle of ${60}^{\circ }$ with the horizontal. At the highest point of its flight it explodes into 3 equal fragments, one going vertically upwards with a velocity 100 m/sec, the second one falling vertically downwards with a velocity 100 m/sec. The third fragment will be moving with a velocity

1. 300 m/s in the horizontal direction

2. 300 m/s in a direction making an angle of 60° with the horizontal

3. 200 m/s in a direction making an angle of 60° with the horizontal

4. 100 m/s in the horizontal direction

Q. A ball of mass m moving with a velocity v undergoes an oblique elastic collision with another ball of the same mass m but at rest. After the collision, if the two balls move with the same speeds, the angle between their directions of motion will be

1. 
2. 
3. 
4. 

Q.

n balls each of mass m impinge elastically each second on a surface with velocity u. The average force experienced by the surface will be

1. mnu

2. 2 mnu

3. 4 mnu

4. 

Q.

A ball of mass $m$ hits the floor with a speed $v$ making an angle of incidence $\theta$ with the normal. The coefficient of restitution is $e$. Find the speed of the reflected ball and the angle of reflection of the ball.

1. 

2. 

3. 

4. 

Q.

A cannon ball is fired with a velocity 200 m/sec at an angle of ${60}^{\circ }$ with the horizontal. At the highest point of its flight it explodes into 3 equal fragments, one going vertically upwards with a velocity 100 m/sec, the second one falling vertically downwards with a velocity 100 m/sec. The third fragment will be moving with a velocity

1. 100 m/s in the horizontal direction

2. 300 m/s in the horizontal direction

3. 300 m/s in a direction making an angle of ${60}^{\circ }$ with the horizontal

4. 200 m/s in a direction making an angle of ${60}^{\circ }$ with the horizontal

Q. name the physical quantity which is common in elastic and inelastic collision.

Q. A particle of mass $m$ moving eastwards with a speed $v$ collides with another particle of same mass moving northwards with same speed $v$. The two particles coalesces on collision. Then, the new particle of mass $2m$ will move with velocity:

1. $\frac{v}{2}\text{North-East}$
2. $\frac{v}{\sqrt{2}}\text{South-West}$
3. $\frac{v}{2}\text{North-West}$
4. $\frac{v}{\sqrt{2}}\text{North-East}$

Q. If the momentum of a particle of constant massincreases by 20%, ther perçentage change in itskinetic energy(2) Does not change(1) Increases by 44%(4) Decreases by 44%(3) Increases by 40%

Q.

A cannon ball is fired with a velocity 200 m/sec at an angle of ${60}^{\circ }$ with the horizontal. At the highest point of its flight it explodes into 3 equal fragments, one going vertically upwards with a velocity 100 m/sec, the second one falling vertically downwards with a velocity 100 m/sec. The third fragment will be moving with a velocity

1. 100 m/s in the horizontal direction

2. 300 m/s in the horizontal direction

3. 300 m/s in a direction making an angle of ${60}^{\circ }$ with the horizontal

4. 200 m/s in a direction making an angle of ${60}^{\circ }$ with the horizontal

Q.

A ball of mass $m$ moving with a speed $u$ collides elastically with another identical ball moving with velocity $u_2$. Find the angle between velocities after collision if they collide obliquely and $u_2$ = 0​

1. $\pi$

2. $\frac{\pi }{2}$

3. $\frac{\pi }{4}$

4. zero

Q. when a collisions elastic ? Total energy conserved in an elastic collision is kinetic energy conserved​