Question

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

Answer 1

B: 10.5s pc.3.5sbdnshd habsbdjebs

Answer 2

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

`\\ \rm\Rrightarrow v=u+at`

`\\ \rm\Rrightarrow t=(v-u)/(a)`

`\\ \rm\Rrightarrow t=(0-7)/(-3.5)`

`\\ \rm\Rrightarrow t=(-7)/(-3.5)`

`\\ \rm\Rrightarrow t=2s`