Question

(ii) Calculate the work required to be done to stop
a car of mass 1200 kg moving at a velocity
80 km/h.
[2]​

Answer 1

Answer:

Step-by-step explanation:

DATA GIVEN IN THE QUESTION :

➡️Mass=1200kg

➡️Initially the velocity of car is (u)=60km/h=60×1000/3600=60000/3600=50/3m/sec

➡️Final velocity of car (v)=0

⏺️Calculation:

⏩WE KNOW THAT:

CHANGE IN KINETIC ENERGY=

Change Kinetic energy

=1/2mv²-1/2mu²

=1/2×1200×0²-1/2×1200×(50/3)²

=600×0-(600×50/3×50/3)

=0-(166666.667)

=-166666.66 J

Work=-166666.66J

(here -sign shows negative work done )

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