A car is running at a rate of 20m/sec. Suddenly, the driver applies brakes and stops the car in 5 secs. Find the value of acceleration of the car.
Answers
Given:
Speed of car = 20 m/s
The driver applies brakes & stops in 5s
To find:
Acceleration of the car
Solution:
Here , the final velocity will be = 0 m/s because the driver applies brakes
Using the kinematic equation
v² - u² = 2as
Where ,
v : final velocity
u : initial velocity
a : acceleration
s : distance travelled
→ 0 - 20 = 2(a)(5)
→ - 20 = 10a
→ a = -20/10
→ acceleration = - 2 m/s²
Note : -ve symbol indicates retardation
Hence , acceleration produced after applying brakes = - 2m/s²
Given:
Speed of car = 20 m/s
The driver applies brakes & stops in 5s
To find:
Acceleration of the car
Solution:
Here , the final velocity will be = 0 m/s because the driver applies brakes
Using the kinematic equation
v² - u² = 2as
Where ,
v : final velocity
u : initial velocity
a : acceleration
s : distance travelled
→ 0 - 20 = 2(a)(5)
→ - 20 = 10a
→ a = -20/10
→ acceleration = - 2 m/s²
Note : -ve symbol indicates retardation
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