Look at the graph above. given that speed= change in distance / change in time, calculate the speed of the object. show your work

20 m/s

Explanation:

Your graph is linear, that means it is trying to say that the object moves exact same amount of distance ( 20 m ) in a unit time ( 1 s ).

That means the speed of the object does not change with time.

Y-axis shows the distance the object traveled and X-axis the time taken.

So as your suggest in your equation, try to find the distance the object moved ( 100 m )  in the given time period ( 5 s )

To find a change you should always subtract final value from initial value,

speed = change in distance / change in time

           =

           =  

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.

hi there!

out of the two, (b) precision would be more reasonable.   however, both a and b could be pretty reasonable.

-awesomerepublic   : )