A body is moving with a speed of 20 m/s. When a certain force is applied, an
acceleration of 4 m/s” is produced. After how much time will its velocity become
80 m/s?
Answers
Ye toh web se nikala song. Xdxd
With the given data, one can easily calculate the value of retardation of the car by using the equation of motion:
v^2 - u^2 = 2as
where
'v' is the final velocity of the car which is 0 (because the car comes to a halt after applying the brakes)
'u' is the initial velocity of the car which is
10 m/s
'a' is the retardation which is to be determined
's' is the distance the car treads after applying the brakes and coming to a halt, which is 20 m
Thus, the retardation comes out to be
2.5 m/s^2
Now, we know that
Force = Mass x Acceleration
Assuming the mass of the car to be M kg, the stopping force comes out to be 2.5M Newtons
Now if this force were to stop the same car travelling at 30 m/s, it would produce the same retardation as it did earlier, because the mass of the car is unchanged.
Now, u = 30 m/s instead of 10 m/s
Using the same equation
v^2 - u^2 = 2as
The stopping distance 's' comes out to be
180 m
The lesson to learn here is that if your car stops in 80 feet doing 80 km/hr does not mean it will stop in 100 feet doing doing 100 km/hr. This is the reason why road authorities hesitate to increase speed limits even by humble amounts!
please mark me as a brainliest
Answer:
Abey bandar tere jese 100 bhi aagaye ge naa to bhi mere se to kam hi rahoge
btw mai bandari ke mu nahi lagti