Avan is traveling at 11.5 m/s. to avoid hitting a deer, the brakes are applied, and the van stops within 3.5 seconds. what is the acceleration?

When stopped, the velocity of the van is 0 m/s.

We can use the formula =   + at, where a is acceleration.

0 m/s = 11.5 m/s + (3.5 s)a

-11.5 = 3.5a

a ≈ -3.28571429 m/s^2

Round it however you need.

answer: the answer is a

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.