Q1. A ball starts at a point 30 m above the bottom of a dip with of 25 m/s. overlook friction, what will be the speed of the ball at the top of the next slope, which is 45 m above the bottom of the dip?

Q2. What direct evidence do astronomers have that supports the heavy element formation in stars?
i) Observed elemental abundances
ii) the presence of technetium in giant star spectra
iii) All of the above are evidence of this.
iv) gamma-ray emissions from decay of cobalt 56 in supernovae
v) light curves of type-I supernovae