How long would it take Jesse with the acceleration of -2.50 m/s to bring his bicycle with an initial velocity of 13.5 m/s to a complete stop

Time taken by Jesse to bring his bicycle =5.4 Sec

Explanation:

acceleration of bicycle = -2.5  m/sec²

Initial velocity of by cycle u =13.5 m/sec,

final velocity of bicycle v = 0 (since bicycle completely stop finally)

Let the time taken to stop the bicycle completely = t sec

We now by equation of motion,

putting the value of u,v & a in the equation

0=13.5 -2.5 x t ( a is taken as negative since velocity of bicycle is reducing)

= 5.4 Sec

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.