Question

a car accelerates for 5 seconds at 2.1 m/s squared if the car intentionally has a speed of 10 m/s what is its new speed

Answer 1

Hey - for this problem you will find out your new velocity (similar to speed)

You take your Initial Velocity and add to it all the gained velocity you get during this process (which is the Acceleration multiplied by the amount of Time you are accelerating for)

So we get (Final Velocity) = (Initial Velocity) + (Time)(Acceleration)

In your equations, thats (Final Velocity) = (10 meters/second) + (5 seconds)(2.1 meters/second/second)

Which is 10 + 10.2 = 20.2 meters/second

Answer 2

Answer:

final velocity will be

$v_f = 20.5 m/s$

Explanation:

As we know that initial speed of the car will be

$v_i = 10 m/s$

acceleration of the car is

$a = 2.1 m/s^2$

time taken is

$t = 5 s$

now we know that

$v_f = v_i + at$

$v_f = 10 + (2.1\times 5)$

$v_f = 10 + 10.5 = 20.5 m/s$