4.The unit of speed of a train is metre per hour
metre per second
kilometer per hour
mile per hour​

Aplane flies directly between two cities, a and b, which are separated by . from a to b, the plane flies into a headwind. on the return trip from b to a, the wind velocity is unchanged. the trip from b to a takes less than the trip from a to b. what is the airspeed of the plane, assuming it is the same in both directions

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

Need this now! do pilots live long