Vinaya’s teacher must have told her that the green coloured covering floating on the surface of pond water can be green algae like Spirogyra, Chlorella, Chlamydomonas, etc.
1. A passenger inside a lift experiences only two forces:
Gravitational force mg directed vertically downwards and
normal reaction force N directed vertically upwards, exerted by the floor of the lift.
2. As...
1. The lift is said to be moving with net upward acceleration in two possible conditions:
when the lift just starts moving upwards or
is about to stop at a lower floor...
