Question

A racing car increases its speed from 10 m/s to 50m/s over a distance of 60 m How long does this take?

Answer 1

Answer:

2 seconds

Explanation:

Givens

d = 60 m

vf = 50 m/s

vi = 10 m/s

t = ?

Equation

d = (vi + vf)*t/2

Solution

60 = (10 + 50) * t / 2            Multiply both sides by 2

60*2 = (10 + 50) * t              Combine the brackets.

120 = 60 * t                          Divide by 60

120/60 = t

t = 2