Question

2 A body travels from A to B at 25 m/s and from B to
A at 50 m/s, then its average speed will be
(a) o
(b) 37.5 m/s
(c) 16.3 m/s
(d) 33.3 m/s​

Answer 1

Answer:

33.33

Explanation:

h

2xy/x+y=2*25*50/25+50=50*50/75=1/3=33.33

Answer 2

Given :

• Initial velocity, u = 25 m/s
• Final velocity, v = 50 m/s

To find :

• Average velocity

According to the question,

$\sf : \implies{Average \: velocity = \dfrac{ Initial \: velocity+ Final \: velocity }{2} }$

$\sf : \implies{ Average \: _{velocity} = \dfrac{25 + 50}{2} }$

$\sf : \implies{ Average \: _{velocity} = \dfrac{75}{2} }$

${ \underline{ \boxed{\sf {\blue{: \implies{ Average \: _{velocity} = 37.5 \: m {s}^{ - 1} }}}}}} \: \bigstar$

$\therefore {\underline{ \sf {So, the \: average \: velocity \: is \: {37.5 \: {ms}^{ - 1} }}}}$

Hence, option b) 37.5 m/s is correct.

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More formulas :

Newtons first equation of motion :

• v = u + at

Newtons second equation of motion :

• s = ut + ½ at²

Newtons third equation of motion :

• v² = u² + 2as