Question

I want a answer of this question​

Answer 1

Answer :-

1. Acceleration is the rate of change of velocity with respect to time

$a = \frac{v - u}{t}$

$\longrightarrow$u = 10m

$\longrightarrow$v = 40m

$\longrightarrow$t = 3s

Substituting the value -

$a = \frac{40 - 10}{3}$

$a = \frac{30}{3} = 10m/s²$

2. In the circular motion the acceleration is constant acting because of change of direction is every second. So the circular motion is the accelerated motion.

$\longrightarrow$Hence, the boy is moving in accelerated motion.

ADDITIONAL INFORMATION -

$\longrightarrow$Rest - An object is at rest if it's position does not change with passage of time w.r.t to observer.

$\longrightarrow$Motion - An object is at motion if it's position change with passage of time w.r.t to observer.

Important formulas -

$\implies$v = u + at

$\implies$v² = u² + 2as

$\implies$s = ut + ½at²

$\implies$Snth = u + (2n - 1)a/2

Thanks

Answer 2

1)

Given:

Initial velocity of object,u= 10 m/s

Final velocity of object,v= 40 m/s

Time taken by object,t= 3 s

To Find:

Acceleration of object

Solution:

We know that,

• Acceleration a is given by

$\pink{\underline{\boxed{\bf{a=\dfrac{v-u}{t}}}}}$

where,

v is final velocity

u is initial velocity

t is time taken

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Let the acceleration of object be a

So,

$\longrightarrow\rm{a=\dfrac{v-u}{t}}$

$\longrightarrow\rm{a=\dfrac{40-10}{3}}$

$\longrightarrow\rm{a=\dfrac{30}{3}}$

$\longrightarrow\rm\green{a=10\ m/s^{2}}$

Hence, the acceleration of object is 10 m/s².

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2)

It implies that the boy is in accelerated motion because he is in uniform circular motion where speed remains same but direction changes due to which acceleration changes.