Question

NCERT CLASS IX - Science Textbook
Chapter 8 - Motion

A bus starting from rest moves with a uniform acceleration of 0.1 m s - '2for 2 minutes. Find (a) the speed acquired, (b) the distance travelled.

Answer 1

acceleration = a  =  0.1 m / s²

u = initial speed = 0  as starts from rest

time duration = 2 min = 120 seconds  during which acceleration is uniformly applied.

v = final velocity = u + a t = 0 + 0.1 * 120 =
   = 12  m/sec

distance traveled = s = (v + u) * t /2 = 12 * 120 /2 = 720 meters

 or,

   s = distance = (v² - u²) / (2 a) 
         = 12² / (2 * 0.1 ) 
         =  720 meters