Mathematics: Solve this problem... Really urgent

Solve this problem... Really urgent - id7204677, cierrajo2020

japerson

31.01.2022

$\boxed{\sf Time \ taken = 15 \ minutes}$

Given:

Initial speed (u) = 65 km/h

Final speed (v) = 85 km/h

Acceleration (a) = 80 km/h²

To Find:

Time taken for car to achieve a speed of 85 km/h in minutes

Step-by-step explanation:

$\sf From \ equation \ of \ motion:$

$\boxed{ \bold{v = u + at}}$

By substituting value of v, u & a we get:

$\sf \implies 85 = 65 + 80t$

Substract 65 from both sides:

$\sf \implies 85 - 65 = 65 - 65 + 80t$

$\sf \implies 20 = 80t$

$\sf \implies 80t = 20$

Dividing both sides by 80:

$\sf \implies \frac{ \cancel{80}t}{ \cancel{80}} = \frac{20}{80}$

$\sf \implies t = \frac{2 \cancel{0}}{8 \cancel{0}}$

$\sf \implies t = \frac{ \cancel{2}}{ \cancel{2} \times 4}$

$\sf \implies t = \frac{1}{4} \: h$

$\sf \implies t = \frac{1}{4} \times 60 \: minutes$

$\sf \implies t = 15 \: minutes$

So,

Time taken for car to achieve a speed of 85 km/h in minutes = 15 minutes

0,0(0 оценок)

ladybugys

13.07.2020

Step-by-step explanation:

If the 12-pack of water bottles at Kroger costs $4.60 then How much would one of those bottles of water cost?

1. Divide the cost by the number of bottles.

4.60 ÷ 12 = $0.38/bottle

0,0(0 оценок)