The free-throw line in basketball is 4.57m (15 ft) from the basket, which is 3.05m (10 ft) above the floor. A player standing on the free-throw line throws the ball with an initial speed of 8.15 m/s, releasing
it at a height of 2.44m (8ft) above the floor. At what angle above the horizontal must the ball be thrown to
exactly hit the basket? Note that the players will use a large initial angle rather than a flat shot because it
allows for a larger margin of error. Explicitly show how you follow the steps involved in solving
projectile motion problems.

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.

with the invention of the automobile, the woman of the house could drive to the store and get groceries. women were also free to socialize more. during world war ii women were allowed to work in factories to the war effort and could drive to work or ride mass transit buses to their jobs.

the answer is b, have negligible mass

does anyone know or what?