A bus accelerates uniformly from rest and acquires a speed of 75 km per hour in 20 seconds find the acceleration
Answers
Answer:
1.041 m / sec²
Explanation:
Given :
Initial velocity u = 0 m / sec
Final velocity v = 75 km / hr
In term of m / sec :
= > v = 75 × 5 / 18 m / sec = 125 / 6 m / sec
Time t = 20 sec
We are asked to find acceleration :
Using first equation of motion :
v = u + a t
= > a = ( v - u ) / t
Putting values here we get :
= > a = ( 125 / 6 - 0 ) / 20 m / sec²
= > a = 125 / 20 × 6 m / sec²
= > a = 125 / 120 m / sec²
= > a = 12.5 / 12 m / sec²
= > a = 1.041 m / sec²
Hence we get required answer.
Answer :
The acceleration produced by the body is 0.972 m/s^2.
Explanation:
Given:
Initial velocity (u) = 0 m/s.
Final velocity (v) = 70 km/h.
Time (t) = 20 seconds.
To find:
The acceleration(a) produced by the body .
Solution:
u= 0 m/s.
v= 70 km/h
=(70×5/18)
= (350/18)
= 19.44 m/s.
Hence, we get the final velocity as 19.44 m/s.
We know that,
a= (v-u)/t
= (19.44-0)/20
= (19.44/20)
= 0.972 m/s^2.
So, the acceleration produced by the body is 0.972 m/s^2.