Question

a skate boarder starts from rest and accelerates a distance of 485 m reaching a final velocity of 20 m/s. How long does it take?

Answer 1

24.25 s

d is equal to 485

s is equal to 20m/s

t is equal to ?

v is equal to d/t

t is equal to d/v

t is equal to 485/20

t is equal to 24.25s

Answer 2

Answer: 48.5s

Step-by-step explanation:

Data:

U = 0m/s

V = 20m/s

S = 485m

T =?

Using the third equation of motion,

S = ½(u+v)t

485 = ½(0 + 20)* t

2* 485 = 20t

970 = 20t

t = 970/20

t = 48.5s