Express 12.5 m/s into km/h ?

An express train takes 1 hours less than a passenger train to travel 132 km between Mysore and Bangalore (without taking into consideration the time they stop at intermediate stations).If the average speed of the express train is 11km/h more than that of the passenger train,find the average speed of the two trains.

The speed of a car weighing 1500 kg increases from 36 km/h to 72 km/h uniformly. What will be the change in momentum of the car?

Express 1 torr in S.I. unit.

Two aeroplane A and B are approaching each other and their velocities are 108 km/hr and 144 km/hr respectively.The frequency of a note emitted by Aas heard by the passenger in B is 1170 Hz.Calculate the frequency of the note heard by the passenger in A.[velocity of sound 350 m(s)^-1 ].

Express the following in the form of x=log_ay : 5^3=125

A police van moving on a highway with a speed of 30 km h_ 1 fires a bullet at a thief’s car speeding away in the same direction with a speed of 192 km h^-1 . If the muzzle speed of the bullet is 150 m s^1 with what speed does the bullet hit the thief’s car ? (Note: Obtain that speed which is relevant for damaging the thief’s car).

A force of 200 N is applied to a body and its velocity changes from 5m/s to 10m/s in a second. What is the mass of the body?

Factorise the following expressions. 25m^2 + 30m + 9

Express in factors : (1+m)^2-(1-m)^2