A motorcycle sees a branch in the road, and hits the brakes, slowing down at -6.42m/s^2. If it takes him 2.85s to stop, what was his starting velocity

The initial velocity of the motorcycle is 18.29 m/s.

Explanation:

Given that,

When a motorcycle hits the brakes, its final speed becomes zero.

Acceleration of the motorcycle,

Time taken to stop, t = 2.85 s

We need to find the initial velocity of the motorcycle. The first equation of kinematics is given by :

So, the initial velocity of the motorcycle is 18.29 m/s.

- measure reactants precisely. ( first choice)

- stir to the reaction take place. ( second choice)

- wait patiently until the reaction completes. ( fourth choice)

- make sure to recover as much copper as possible. ( last choice)

i think the answer would be reserve.