Question

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Answer 1

Answer:

a) v=u+at is the first equation of motion.

In this v=u+at equation,

u is the initial velocity

v is the final velocity

a is acceleration

t is the time period

The given equation is derived from the acceleration point of view. (It can also be derived from velocity and time graph)

We know that acceleration is defined as the rate of change of velocity

So,  

a= v-ut  

Rearranging the terms in the above equation we get,  

v=u+at  

The equations of motion are also used in the calculation of optical properties

b) your answer is in the pic.

Hope this helped you :D

Answer 2

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a)It means final velocity is always equal to initial velocity plus acceleration into time.

b)Initial velocity  = u = 0

distance traveled = s  = 100 m

Time = t = 5 sec

 a = acceleration

Equation of motion :-

s = ut + 1/2at²

   = 0 + 1/2 a × 5 × 5

100 = 1/2a × 25

1/2a = 100 / 25

1/2a = 4

a = 4 × 2

    = 8 m/s²

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