Question

After accelerating at -4.3 m/s? for 6 seconds a blue car is traveling 5.0 m/s. How fast was it initially traveling?

How fast was the blue car initially traveling after accelerating at -4.3 m/s² for 6 seconds?

a) 0.78 m/s
b) 1.22 m/s
c) 2.78 m/s
d) 3.22 m/s

Answer 1

The blue car was initially traveling at a speed of 30.8 m/s.

Step-by-step explanation:

To find the initial speed of the blue car, we can use the equation:

v = u + at

where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time.

Given that the final velocity is 5.0 m/s, the acceleration is -4.3 m/s² (negative because it is decelerating), and the time is 6 seconds, we can substitute these values into the equation to find the initial velocity:

5.0 = u + (-4.3)(6)

5.0 = u - 25.8

u = 5.0 + 25.8

u = 30.8 m/s

Therefore, the blue car was initially traveling at a speed of 30.8 m/s.