a car starting from rest has a constant acceleration ‘a1’ for time iterval ‘t1’ during which it covers a distance ‘s1’. in the next time interval ‘t2’ the car has a constant retardation ‘a2’ and comes to rest after covering a distanc ‘s2’ in time ‘t2’. the average speed of the car during its entire journey is given by?
A light spring of spring constant k is kept compressed between two blocks of masses m and M on a smooth horizontal surface . When released, the blocks acquire velocities in opposite directions. The spring loses contact with the blocks when it acquires natural length. If the spring was initially compressed through a distance x , find the final speeds of the two blocks .