Question

Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?

Answer 1

GIVEN,
           v = 60 km / h = 60 * $\frac{5}{18}$ = 16.67 m/s
           m = 1500 kg
       W =    $E_{k}$ = ?
             
           $E_{k}$ = $\frac{1}{2}$ * m * $v^{2}$
                                      = $\frac{1}{2}$ * 1500* $(16.67)^{2}$
                                      =  0 .5 * 1500 * 277 . 8889
                                       = 750 * 277 . 8889
                                      = 208416 . 68 J 
                                       

Answer 2

Hey there!

Given,

Mass of car (m) = 1500 kg

Velocity of car ( v) = 60 km/h = 60 * 5/18 m/s

Work done = ?

Here,

Work done = Kinetic Energy

                  = 1/2 * mv²

                  = 1/2 * 1500 * 60 * (5/18) J

                  = 20.8 × 10⁴ J (←Answer)

Hope It Helps You!