Question

plz help me

(physic )

(b) A bus decreases its speed from 80 km h-1 to 60 km h-1 in 5 s. Find the acceleration of the bus.


(c) If action is always equal to reaction, explain how a horse can pull a cart.


( CHEMISTRY)


2. Anaswer the followings :

(a) The smell of hot sizzling food reaches you several meters away, but to get the smell from cold

food you have to go close. Why ?


(b) Give reasons: (i) A gas fills completely the vessel in which it is kept .


(ii) A gas exerts pressure on the walls of the container.


(c ) Classify the following as physical or chemical changes:

(i) Cutting of trees .

(ii) Melting of butter in a pan.

(iii) Rusting of almirah.

(iv) Boiling of water to form steam.


( BIOLOGY)

3. Answer the following questions :
(a) What is Agriculture ? What do you mean by sustainable agriculture?


(b) What is Ozone layer ? What are the ill effects of Ozone layer depletion?


(c) Write two functions performed by Golgi apparatus .


(d) What are the uses of Air?​

Answer 1

Answer:

(b) Initial speed of bus (u) = 80km/h

80*1000/3600

80/36 m/s

final speed of bus(v)= 60km/hr

60*1000/3600

60/36 m/s

acceleration = v-u/t

600/36-800/36/5

=-1.11m/s²

Explanation:

so ,bus is decelerating at rate of -1.11m/s²