Question

19. A boy running in a straight line increases his velocity from 12 km/hr to 20 km/hr in 20 sec.
Find his average acceleration ​

Answer 1

Answer:

Acceleration ( a ) of a body is defined as rate of change of velocity with respect to time , i.e

✔️ Acceleration = ( final velocity - initial velocity ) / time

⏺️Final velocity ( v ) = 20 Km / h = 5.5 m / s

⏺️ Initial velocity ( u ) = 12 Km / h = 3.3 m / s

⏺️time ( t ) = 20

▶️ Velocity is converted be we need SI unit in same form

=> a = ( v - u ) / t

=> a = ( 5.5 - 3.3 ) / 20

=> a = 2.2 / 20

=> [ a = 1.1 m / s^2 ]✔️✔️

♠️ Acceleration is 1.1 m / s^2