Two runners start a race. after 2 seconds, they both have the same velocity. if they both started at the same time, how do their average accelerations compare?

let each runner starts from rest

v₀ = initial velocity of each runner = 0 m/s

t = time of travel = 2 sec =

a = average acceleration

average acceleration is given as

a = (v - v₀)/t

inserting the values

a =  (v - 0)/t

a = v/t

since each runner gains equal amount of speed in given time interval of "t". hence the average acceleration of each runner is same.

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.