a transformer has primary voltage 240V and primary current 2mA. Find number of turns in primary coil Np and secondary voltage Vs if transformer is 100% efficient

frequency or wavelenth of em radiation in a vacuum

because growing process had stoped after 4-5 year

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.