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How long does it take for a bicycle traveling 7.0 m/s to come to a stop if the
brakes provide an acceleration of -3.5 m/s2
A. 7.0 S
B. 10.5 s
O C. 3.5 s
D. 2.0 s

Respuesta :

  • initial velocity=u=7m/s
  • Final velocity=v=0m/s
  • Acceleration=a=-3.5m/s^2

[tex]\\ \rm\Rrightarrow v=u+at[/tex]

[tex]\\ \rm\Rrightarrow t=\dfrac{v-u}{a}[/tex]

[tex]\\ \rm\Rrightarrow t=\dfrac{0-7}{-3.5}[/tex]

[tex]\\ \rm\Rrightarrow t=\dfrac{-7}{-3.5}[/tex]

[tex]\\ \rm\Rrightarrow t=2s[/tex]
B: 10.5s pc.3.5sbdnshd habsbdjebs

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