i need help (yr 9 & 10 advanced maths) ^_^ is there sum 1 out there lol ^_^ (1 Viewer)

[light_~@~ngel]

heyz pplz

i need help cuz i dont really get this maths question>>> if sum1 could help>>> it would be great>> well im a yr 7 student yeah and the question is>>



an object dropped from rest is acted upon gravity. it will have a velocity of

v km/h after falling d metres (ignoring air resistance) according to the formula

v=8.4 x square root d.

a) make d the subject of the formula

b) hence or otherwise, find how far the object will have to fall before its velocity is 42km/h?​

 

[Sparcod]

We've found the youngest member! Are you sure this is yr 7/8 stuff?

 

[pLuvia]

This should be in School Certificate Forum

An object dropped from rest is acted upon gravity. it will have a velocity of

v km/h after falling d metres (ignoring air resistance) according to the formula

v=8.4 x square root d.

a) make d the subject of the formula

b) hence or otherwise, find how far the object will have to fall before its velocity is 42km/h?

a
v = 8.4 x root d
v / 8.4 = root d
d = v² / 70.56 (squaring both sides)

b

Sub v = 42km/h into the new equation

d = 25 m

 

[Sparcod]

d=v^2/70.56

 

[light_~@~ngel]

hi

We've found the youngest member! Are you sure this is yr 7/8 stuff?

its um 9/10

 

[light_~@~ngel]

kool

This should be in School Certificate Forum

An object dropped from rest is acted upon gravity. it will have a velocity of

v km/h after falling d metres (ignoring air resistance) according to the formula

v=8.4 x square root d.

a) make d the subject of the formula

b) hence or otherwise, find how far the object will have to fall before its velocity is 42km/h?

a
v = 8.4 x root d
v / 8.4 = root d
d = v² / 70.56 (squaring both sides)

b

Sub v = 42km/h into the new equation

d = 25 m

THANX HEAPS>> U ROK

 

[Riviet]

Wow a junior maths accerelant! Welcome to the bos forums! :wave:

If you need more help with maths, you can post your question in the Mathematics forum or PM me.

 

[Bookie]

get away while you can.

 

[Rax]

get away while you can.

LOLOLOL
Funny