Help me to solve these numericals.!! (1)A motorcycle is moving with the velocity of 40m/s. If the velocity increases to 60m/s after 2 minutes, find its acceleration.
(2)A stone is vertically thrown upward and reaches at the height of 5m after 2 seconds. find it's initial velocity.

In a system, when potential energy decreases, then entropy also decreases. true false

Hydrogen atoms are excited by a laser to the =4n=4 state and then allowed to emit. what is the maximum number of distinct emission spectral lines (lines of different wavelengths) that can be observed from this system? 8 6 2 7 4 5 1 3 calculate the wavelength of the 4⟶14⟶1 transition. =λ=

Which form of cell division creates the sperm and egg, resulting in half of the chromosomes as the other cells?