Need Help with maths.

[werto165]

I have no idea how to do this question... 

it's something to do with connected rates of change. Perhaps splitting the distance travels is x differentiating x with respect to time will get me :

 

dx/dt = Velocity of Raphael. 

 

doing a similar thing for the shadow I will get naming the distance from the lamp the end of the shadow is as s: 

 

ds/dt = V of shadow. 

 

I have no idea where to go from here. Any help would be nice  

[Nineshadow]

Ah, this is easy

It's mainly geometry.

 

The two triangles are similar, and the shadow moves along a bigger distance than he does in the same time.

 

Still need more help?

PS: it's half the height of the lamp

[werto165]

Ah, this is easy

It's mainly geometry.

 

The two triangles are similar, and the shadow moves a bigger distance than he does in the same time.

 

Still need more help?

The more I try to do it the more I end in a dead end. 

[Nineshadow]

The more I try to do it the more I end in a dead end. 

Fine...

Here you go :

You start from underneath the lamp post. Then, you get another position, doesn't matter which.

[werto165]

Fine...

Here you go :

You start from underneath the lamp post. Then, you get another position, doesn't matter which.

 

Thanks, I worked it out in the end, just mine was more convoluted way of working it out, it doesn't really help when you don't visualise the problem. 

[asim1999]

i thought iHammmy started this thread for a second...