Question

A runner begins running from rest (0 m/s) with an acceleration of 2 m/s? What is the

speed of the runner 5 seconds later?

Answer 1

10 m/s

Step-by-step explanation:

Multiply 2 m/s by 5.

1 second: 2 m/s

2 seconds: 4 m/s

3 seconds: 6 m/s

4 seconds: 8 m/s

5 seconds: 10 m/s

This can also be solved by y=mx+b, where y is speed, m is the m/s, so 2, x is time, we want to find what y equals when x=5, and b is starting speed, which is 0 m/s, since the runner is starting from a rest.

In short, this is:

x=5

y=2x

y=2(5)

y=10

Answer 2

10

Step-by-step explanation:

U=0

V=?

a=2

times=5

a=(v-u)÷t

2=(x-0)÷5

10=x-0

10ms^-1=x