Question 6 of 10 A car with a mass of 1,300 kg travels a distance of 200 m as it moves from
one stoplight to the next. At its fastest, the car travels at 20 m/s. What is its
kinetic energy at this point?
A. 520,000 J
B. 2,600 J
C. 260,000 J
D. 13,000 J

C. 260,000

Explanation:

it's not that hard just do the work

i hope this helps

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.