Aball is thrown straight up into the air with an initial speed of 8.0 m/s. how long does it take for the rocket to reach its highest point?

Correct answer is:  t = 0.8 seconds

Explanation:

This movement is a vertical shot upwards, the formula is:

V = V₀ - g t  , where V₀ is the initial velocity and V is the final velocity

when the ball reaches its highest point the final velocity V is equals to zero

then it is:

V₀ = g t    if we get g = 10 m/s²

t = V₀ / g = 8 / 10 = 0.8 seconds

t = 0.8 seconds

God is with you!!!

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.