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
Answered by
120
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 first kinematic equation
v = u + at
Where ,
- v : final velocity
- u : initial velocity
- a : acceleration
- t : time
→ 0 = 20 + a(5)
→ - 20 = 5a
→ a = -20/5
→ acceleration = - 4 m/s²
Note : -ve symbol indicates retardation
Hence , acceleration produced after applying brakes = - 4m/s²
Answered by
80
Answer:
Given
u=20m/s
v=0
t=5
a=?
now
a=v-u/t
a=0-20/5
= -20/5
= -4
hence a= -4m s^-2
as the body is regarding the a is negative
hope it will help u
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