Question

E79: Substitute values into more general algebraic expressions.

v= u + at
u = 1
a = 3
t = 1/2
Work out the value of v.

Answer 1

v = u + at
v = 1 + (3x 1/2)
v = 1 + 1.5
v = 2.5

Answer 2

Answer:
`v=(5)/(2)`

Explanation:

First, substitute the variables with the given values.

`v=u+at` turns into
`v=1+(3)((1)/(2) )`

First, multiply what is in the parentheses

`(3)((1)/(2))=(3)/(2)`

`v=1+(3)/(2)`

Turn 1 into a fraction over 2 by multiplying 1 by 2 and using it as the numerator

`1=(2)/(2)`

`v=(2)/(2) +(3)/(2)`

Add

`v=(5)/(2)`