Face Masks for dark spots , helps you get rid of them ..but there isn't anything to reduce the spots , but they appear because of oily skin
Vitamin D I think not sure check google
The pendulum weight swings side to side. It has maximum kinetic energy when it is mid-swing, closest to the ground. At this point it swings back up. Its kinetic energy is transformed to gravitational potential energy. Its maximum gravitational potential energy occurs when it is at its maximum height, when it stops, just before swinging to the other side.
