NEWTONS LAWS please help

1. Which Law? When you are standing up in a subway train, and the train suddenly stops, your body continues to go forward.

A. Law 1

B. Law 2

C. Law 3

2. Which Law? A swimmer pushes water back with her arms, but her body moves forward.

A. Law 1

B. Law 2

C. Law 3

3. Which Law? After you start your motorcycle, as you give it more gas, it goes faster.

A. Law 1

B. Law 2

C. Law 3

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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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.

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the components of a vector are the parts of the vectors that are to each other.

b perpendicular