Q. 324.6( 21 Votes )

# An aircraft traveling at 600 km/h accelerates steadily at 10 km/h per second. Taking the speed of sound as 1100 km/h at the aircraft’s altitude, how long will it take to reach the ‘sound barrier’?

Answer :

According to the Question,We have:-

Initial velocity, u = 600 km/h (Given)

Final velocity, v = 1100 km/h(Given)

Acceleration = 10 km/h/s

From relation, v = u+at,

On rearranging the terms, we get, v - u = at

or

∴ t = 50 seconds

Hence it will take the aircraft 50 seconds to reach the "sound barrier"

Rate this question :

Given figures represent the motion of two objects P and Q. Which of the objects has positive acceleration and which one has negative acceleration?

Fill in the blanks.

(i) ………..is the term used for negative acceleration.

(ii) A bus starting from rest attains a velocity of 54 km/h in 60 s, its acceleration is …………….. .

All In One - ScienceUniform and non-uniform acceleration

Evergreen - ScienceWhen you apply brakes to a car, in which direction is its acceleration?

Evergreen - ScienceGive an example of negative acceleration from daily life situation.

Evergreen - ScienceWhat does the slope of a velocity – time graph represent?

Evergreen - Science