Question

A sedan car of mass 200kg is moving with a certain velocity . It is brought to rest by the application of brakes, within a distance of 20m when the average resistance being offered to it is 500N.What was the velocity of the motor car?​

Answer 1

GIVEN :

⠀⠀⠀⠀⠀⠀⠀⠀⠀m = 200 kg

⠀⠀⠀⠀⠀⠀⠀⠀⠀s = 20 m

⠀⠀⠀⠀⠀⠀⠀⠀⠀v = ?

⠀⠀⠀⠀⠀⠀⠀⠀⠀f = -500 N

∴ WE KNOW

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀f = m × a

⠀⠀⠀⠀⠀⇒-500 = 200 × a

⠀⠀⠀⠀⠀⇒a = -2.5m/s²

NOW,

⠀⠀⠀⠀⠀⠀⠀⠀⠀v² = u² + 2as

⠀⠀⠀⠀⠀⇒0 = u² + 2 × -2.5 × 20

⠀⠀⠀⠀⠀⇒0 = u² - 100

⠀⠀⠀⠀⠀∴ u² = 10m/s

Answer 2

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