Question

A boy of Mass 40kg is cycling at speed of 90km/h after 50m distance it stops find breaking force​

Answer 1

Hope it will help have a great day..........

using the equation,

v² - u² = 2as

we can find the acceleration

Here,

final velocity (v) = 90 km/h = 90 × 5/18 = 25 m/s

Initial velocity (u) = 0 m/s

Distance (s) = 50 m

so,

25² - 0² = 2 × a × 50

625 = 100 a

625/100 = a

so acceleration = 6.25 m/s

Now force = ma

                = 40 × 6.25

                = 33.75 N

Hence 33.75 N is the required breaking force