Fill in the blanks. (i) ………..is the term used for negative acce

1.	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 …………….. .
Answer» (i) Retardation is the term used for negative acceleration. Explanation: If the velocity of an object is decreasing, it is said to have negative acceleration. (ii) A bus starting from rest attains a velocity of 54 km/h in 60 s, its acceleration is 0.25 m/s² . Explanation: initial velocity = 0 time = 60 secs final velocity = 54 km/hr =\(\frac{54\,\times\,1000}{60\,\times\,60}\) m/s = 15 m/s Acceleration = \(\frac{change\,in\,velocity}{time\,taken}\) = \(\frac{final\,velocity\,(v)\,-intial\,velocity(u)}{time\,taken(t)}\) = \(\frac{15\frac{m}{s}-0}{60 sec}\)= = 0.25 m/s²

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 …………….. .

Answer»

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

Explanation: If the velocity of an object is decreasing, it is said to have negative acceleration.

(ii) A bus starting from rest attains a velocity of 54 km/h in 60 s, its acceleration is 0.25 m/s² .

Explanation: initial velocity = 0

time = 60 secs

final velocity = 54 km/hr =\(\frac{54\,\times\,1000}{60\,\times\,60}\) m/s = 15 m/s

Acceleration = \(\frac{change\,in\,velocity}{time\,taken}\)

= \(\frac{final\,velocity\,(v)\,-intial\,velocity(u)}{time\,taken(t)}\)

= \(\frac{15\frac{m}{s}-0}{60 sec}\)= = 0.25 m/s²