Please help me this question
2. The diagram below shows two marbles moving in opposite direction with
speeds as shown.
(a) If the velocity of the 30.0g marble after collision is 0.1m/s to the left
What is the velocity of the 10.0g marble after collision?

(b)Calculate the kinetic energy before and after collision, hence deduce the
value of the kinetic energy lost.

THE DIAGRAM ISNT LOADING HOW DO I HELP YOU

Explanation:

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases . this process does not change the mass number.

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as -decay. in this the mass number remains same.

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.

the part of the wave he is travelling on is the crest