Physics Help HERE ONLY !!

[holtadit]

The speed of a cyclist reduces uniformly from 2.5 m/s to 1.0 m/s in 12 s.

(a) Calculate the deceleration of the cyclist.

deceleration = ..................................

(b) Calculate the distance travelled by the cyclist in this time.

distance = ..................................

How would u do the (b) part ? The examiners report says that it should be average speed multiplied time... but how do u get the average speed ? Please show your workings !

[astarmathsandphysics]

Average speed is (u+v)/2=(2.5+10)/2=6.25

[saleemsamer]

Average speed is (u+v)/2=(2.5+10)/2=6.25

it is 1.0 not 10

[astarmathsandphysics]

Shoot me

\skldnb c1juk

sHOOT ME AGAIN!!!!!!!!!!!!

[holtadit]

Okay I really need help in Paper 3 2008 may Question 5 (c)

Why do you haave to subtract 2.1g from 16.3 grams ?

The Examiners Report says that many student didnt understand the significance of the 2.1g melted in the 2 minutes.

So what is the significance ?

[astarmathsandphysics]

The 2.1 g would have melted without the heater

[holtadit]

I thought about that too... but the mark scheme says:

using Q=ml  do (2.1-1.3)/4min * 60

If the 2.1 grams melted without the heater in the next 2 minutes why is a total of 4 minutes being used in Q=ml ??

[holtadit]

help ?

[astarmathsandphysics]

I will read the q again. I only said what I remembered last time I answered this.

[astarmathsandphysics]

https://studentforums.biz/index.php/topic,1833.msg36500.html#msg36500