A bowling ball rolls off a cliff at 5 m/s. The vertical velocity after 1 second is A. 9.8 m/s
B. 19.6 m/s
C. 29.4 m/s

A. 9.8 m/s

Explanation:

The vertical velocity of an object increases by 9.8 m/s each second. After 1 second, the bowling ball would have a vertical velocity of 9.8 m/s.

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.

e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.