What is the acceleration of a baseball that has a final velocity of 15.0 m/s when it crosses the plate 2.0 seconds after leaving the pitchers hand? The initial velocity is 0./0 m/s and the baseball is traveling forward.

7.5m/s²

Explanation:

Acceleration is the change in velocity of a body with respect to time.

acceleration = change in velocity/time

a = Δv/t

a = v-u/t

v is the final velocity = 15.0m.s

u is the initial velocity = 0.0m/s

t is the time = 2.0s

Substituting the values to get a

a - 15-0/2

a = 15/2

a = 7.5m/s²

Hence the acceleration of the baseball is 7.5m/s²

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.

dang that balls went far