A particle X made up of 2 protons and 2 neutrons is emitted from a Polonium - 210 nucleus, travelling with a speed of 20,000 m/s. a) What element is the nucleus after the particle is emitted?
b)Calculate the kinetic energy of particle X

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation:

what was the acceleration of the 2 kg cart?

⇒ 16.0 cm/s2

what was the acceleration of the 4 kg cart?

⇒ 8.1 cm/s2

what was the acceleration of the 6 kg cart?

⇒ 5.3 cm/s2

this would be about 43%