Choose the correct A helicopter moves with a constant velocity v, = 4 m/s from point A to point B during a time
interval tas = 10 s. It then accelerates from point B to point with constant acceleration a, -
2m/s2 for a time interval tpc = 20 s. The average velocity of this helicopter for the whole trip is
equal to:
H
tab=10 s
V =4 m/s
A
B В
tac= 20 s
az= 2m/s2​

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.      

i think its 5049.

i hope this !