I need help please its exam( science )

Apendulum has a mass of 1.5 kg and starts at a height of 0.4 m. if it is released from rest, how fast is it going when it reaches the lowest point of its path? acceleration due to gravity is g = 9.8 m/s2. a. 2.8 m/s b. 0 m/s c. 5.9 m/s d. 4.3 m/s

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?