a car moving with a velocity of 54 km/hr on a straight road stops on applying brakes 20m. compute the acceleration of the car after covering a distance of 20m. compute the acceleration of the car
Answers
Answered by
227
Intial velocity of car, u = 54 km/h = 54 × 5/18 m/s
u = 15 m/s
Car stops on applying brakes 20m
Displacement is covered by car ,S = 20m
finally car stops ∴ final velocity of car , v = 0
Now, use formula
V² = u² + 2aS , here a is Acceleration
⇒ 0 = (15)² + 2 × a × 20
⇒ -225 = 40a
⇒ a = -5.625 m/s² [ here negative sign shows that acceleration is opposite direction of motion of car ]
Hence, magnitude of acceleration = 5.625 m/s²
u = 15 m/s
Car stops on applying brakes 20m
Displacement is covered by car ,S = 20m
finally car stops ∴ final velocity of car , v = 0
Now, use formula
V² = u² + 2aS , here a is Acceleration
⇒ 0 = (15)² + 2 × a × 20
⇒ -225 = 40a
⇒ a = -5.625 m/s² [ here negative sign shows that acceleration is opposite direction of motion of car ]
Hence, magnitude of acceleration = 5.625 m/s²
Answered by
16
Answer:
5.625m/s²
Explanation:
Hope it helps you
Similar questions