In Van$-$derwall$$s equation,

$(+$

$2)()=$

Where P is pressure

V is the Volume

T be the Temperature

R be the gas constant

What is the dimension of a and b$?$

$2.$ Rain is Falling vertically with a speed of $30$ m$/$s$.$ Suddenly wind starts blowing from north to

south with a speed of $10$ m$/$s$.$ In what direction should the person waiting at the bus station hold

the umbrella to be protected from the rain.

$3.$ An object is dropped from the top of the tower of height $200$ m and the same time, another

object is thrown vertically upward with a velocity of $80$ m$/$s from the foot of the tower, when

and where the two objects meet?