The slopes of the windscreen of two motorcars are `beta_(1) = 30^(@)` and `beta_(2) = 15^(@)` respectively. At what ratio `v_(1)//v_(2)` of the velocities of the cars will their drivers see the hailstones bounced by the windscreen of their cars in the vertical direction ? Assume that haistones fall vertically.

The slope of wind screen of two cars are alpha_(1)=30^(@) and a_(2)=15^(@) respecively. At what ratio of (v_(1))/(v_(2)) of the velocities of the cars will their drivers see the hall stones bounced back by the wind screen on their cars in vertical direction assume hall stones fall vertically downwards and collisions to be elastic?

The slopes of wind screen of two cars are alpha_1=30^@ and alpha_2= 15^@ respectively. At what ratio v_1/ v_2 of the velocities of the cars will their drivers see the hail stones bounced back by the wind screen on their cars in vertical direction? Assume hail stones fall vertically downwards and collisions to be elastic.

If two particles of masses m_(1) and m_(2) are projected vertically upwards with speed v_(1) and v_(2) , then the acceleration of the centre of mass of the system is

µ_(1) and µ_(2) are the refractive index of two mediums and v_(1) and v_(2) are the velocity of light in these in two mediums respectively. Then, the relation connecting these quantities is

Hailstones falling vertically with speed of 10 m/s hit with respect to himself the windscreen of a moving car and rebound elastically. Find the velocity of the car if the driver find the haolstones rebound vertically after striking. Windscreen makes an angle 30^(@) with the horizontal.

A bird flies to and fro between two cars wich move with velocities v_(1) and v_(2) , If the speed of the bird is v_(3) and the initial distance ofseparation between then is d , find the total distance covered bythe bird till the cars meet. .

The velocity of sound waves in an ideal gas at temperatures T_(1) K and T_(2) are respectively v_(1) and v_(2) . The rms velocity of gas molecules at these two temperatures are w _(1) and e_(2) , respectively then

Velocity of light ray in two media A and Bare v_(1) and v_(2) respectively. What is the refractive index of A with respect to B?