Question

a bicycle and its rider together have a mass of 80 kg. if the bicycle's speed is 6m/s, how much force is needed to bring it to a stop in 4 seconds.

Answer 1

`\huge\boxed{\sf F = 120 \ N}`

Step-by-step explanation:

Given data:

Mass = m = 80 kg

Initial velocity =
`V_i` = 0 m/s

Final velocity =
`V_f` = 6 m/s

Time = t = 4 s

Required:

Force = F = ?

Formula:

`\displaystyle F=(m(v_f-v_i))/(t)`

Solution:

Put the given data in the above formula.

Finding force.

`\displaystyle F=(80(6-0))/(4) \\\\F = (80(6))/(4) \\\\F = 20(6)\\\\F = 120 \ N\\\\\rule[225]{225}{2}`