Equation of Motion : How to Select the Right Equation?

Equation of Motion : How to Select the Right Equation? LIVE Class at 8 PM Today! We will look at important questions and how to choose the correct Equation of Motion!

At Manocha Academy, learning Science and Math is Easy! The school coursework is explained with simple examples that you experience every day! Yes, Science & Math is all around you! Let's learn every day from everyday life!

[Sambhav_]

Legends watching just before going to school to give exam

[mananaya_d_]

In last question,
Given:- u=72 km, v=36 km, s=10m.
Now, Convert these into m/s
* 72×5/18=20m/s
* 36×5/18=10m/s
Using 3rd Equation of motion:-
=v*square=u*square+2as
= 10*2=20*2+2(a)(10)
= 100=400+20(a)
= 100-400= 20(a)
= -300=20(a)
= a=-300/20
= a= -15m/s

[okidamotunrayo]

U =72km/hr conv to m/s
72 x 1000/60 x 60= 20m/s

V=36km/hr conv to m/s
36 x 1000/60 x 60= 10m/s

Using the formula
V² = U² + 2as
10²= 20² + 2(a x 10)
100 = 400 + 20a
20a= 100 - 400
a = -300/20
a= -15m/s

[sangitakumari]

I wish I would have this type of teachers in my school... As my physics teacher she just read the chapter and when it comes to explaintion she repeat all word 😔

[avidoes]

The answer is at follows for the last question:

u= 72 km/hr = 20 m/s
v= 36 km/hr = 10 m/s
S= 10 m
a= ?
v^2=u^2+2aS
10^2=20^2+2*a*10
100 = 400+20a
-20a=400-100
-20a=300
a=-300/20
a=-15 m/s^2
As we need to find the Retardation, we need to write the retardation as 15 m/s^2
Do NOT write retardation as -15m/s^2

Thank you!

[risewithme]

I was totally confused in three equations of motion .But after this lecture, I became confident for my exams after 2 weeks.Thank you very much .

[user_zyue]

Using their equation we have,
V²=u²+2as
Given 72 km h-¹ and 36km h‐1 converting to m first
72×5/18=20m/s
And 36×5/18=10m/s
Now we have v = 10 and u =20 and s=10
V²=u²+2as
10²=20²+2×a×10
100=400+2a×10
2a=100-400/10
2a=-300/10
2a=-30
A=-30/2
And we know 2×15=30 so
A=-30/2=-15 m/ s
You can also do this by not changing into m

[Dark_secret]

Welcome to 2023 somedays before the final exam 🙂😐

[s.sumanth]

The best teacher I have found, proud of u sir ❤️❤️

[thordesiarmy]

Third equation here is different side change in my book, school it is 2as=v²-u²

[aligetiakshitha]

U explaing very well, my physics teacher also explain like u, for more understandation I will see ur video s, I have also subscribed ur channel

[emmanulemoses]

Thank u very very much for helping me in life all the way from Nigeria🇳🇬

[b.venkatvenkataswamy]

Thank you so much for helping me to understand this concept of how to select equations very clearly u built my self confidence thank you so much sir

[Ray-xmpd]

Thank you sir. I was trying to solve the numericals given by my teacher and this helped me.

[premkumarkancharla.]

Sir your explanation was excellent and we are getting a lot knowledge by you keep doing this sir .

[allsucks...allsucks...]

Seriously 😳 it wasn't that easy.. My physics teacher was teaching me these for last 3-4 days. And I was understanding nothing.. Now your class of just 49 minutes have cleared all of my doubt on this topic.. Thank you sir😊.. May you live long... God Bless you...

[sudhangsumohannath]

So, much Thank you sir.
You,
Cleared all my doubts

[Jiteshsairwa]

Thnxx for helping me and other students
After watching your video I solve all question of motion and I am very confused about which formula is taken for question after watching your video my problem is solved 🙏🙏🙏

[prabhakaran]

v2 = u2 +2as
U= 20 m/s V= 10 m/s
S= 10m

100= 400 + 2(a) (10)
100-400 = 20a
-300 ÷ 20 = a

a= -15 m/s2

[ritwiksrivastava]

using
V²=u²+2as
v= 10m/s
u=20m/s
s=10m

putting the values
V²=u²+2as
100=400+2(a x 10)
100 = 400 +20a
100-400 = 20a
-300=20a
a= -300/20
a= -15

so the retardation of the car is = -15 m/s x s