Physics: Post your doubts here!

[Thought blocker]

Thanks btw, Why is u=0?

No, initial speed given.

 

[unique111]

Its * 60N is applied to the trolley..... Answer : C

 

[unique111]

No, initial speed given.

Do we always assume u to be 0 if it is not mentioned in the question?

 

[Thought blocker]

Its * 60N is applied to the trolley..... Answer : C

Is this a full question ?? I think something is missing.

 

[Thought blocker]

Do we always assume u to be 0 if it is not mentioned in the question?

IF you can find initial speed, or if u required to get other quantity, then do not assume U as O

 

[unique111]

Yup it is. The part where it says retarding force of "60 N is applied to the trolley." is a bit blurred

 

[Thought blocker]

Yup it is. The part where it says retarding force of "60 N is applied to the trolley." is a bit blurred

I d k this one I am in hurry, catch u later. I'll solve it, Its easy

 

[unique111]

It's okay, bro. Someone else will extend their helping hand. * you're my genius though

 

[Thought blocker]

It's okay, bro. Someone else will extend their helping hand. * you're my genius though

No need. I got it.
a = F / m => a = -60N /30kg = -2m/s^2 (the force and acceleration are negative b/c the force opposes motion and the trolley slows down)
a = (change is velocity) / time => -2m/s^2 =[ v(f) - 3.0m/s] / 0.5s. Solving for V(f) we have: v(f) = 2m/s

 

[unique111]

No need. I got it.
a = F / m => a = -60N /30kg = -2m/s^2 (the force and acceleration are negative b/c the force opposes motion and the trolley slows down)
a = (change is velocity) / time => -2m/s^2 =[ v(f) - 3.0m/s] / 0.5s. Solving for V(f) we have: v(f) = 2m/s

wohoo! thanks

 

[Thought blocker]

wohoo! thanks

Np

 

[Thought blocker]

unique111

 

[Thought blocker]

unique111

 

[ZaqZainab]

I dont know this , Help - usama321 Suchal Riaz snowbrood ZaqZainab asma tareen The Godfather

Looks like i am late XD

 

[Thought blocker]

sorry Thought blocker but i dont take bio

I haven't ask u anything

 

[Thought blocker]

than who tagged me sorry let me see again

It was a mistake tag, it was an answer for unique111

 

[Thought blocker]

I said, it was a mistake tag.

 

[usama321]

Can somebody help me with this? It seems quite easy, cause its in number 5, but i couldn't figure out where to start from. Much help appreciated.

V2=U2+2as
V2=0+2*0.2*1000=400 'Change 1km to m'
V=Root of 400
V=20m/s

actually v square would be zero as it is the final speed, and you are finding the initial speed which is u.. You got the right answer in this case, but it could just as well have been wrong. u is initial and v is final

 

[Thought blocker]

actually v square would be zero as it is the final speed, and you are finding the initial speed which is u.. You got the right answer in this case, but it could just as well have been wrong. u is initial and v is final

Thanks for correction

 

[Ali_00921]

May June 2013 52.
Q1. Can someone draw.the.diagram.
Please. Thank You In Advance