Question

answer me as fast as possible plz I'll mark them as brainliest answer so plz answer me as fast as possible ​

Answer 1

Answer:

(9) u= 20 m/s

     a= 4 m/s^2

      v = u + at = 20 + 4×2 = 28 m/s

     speed will be 28m/s

(10) While catching a fast moving ball, if the fielder does not pull back his arms             he may get injured by the ball.

(11) 1. Optical fibers are used in endoscopy to see the internal organs of our body.

2. Optical fibers are used in transmitting communication signals through light pipes.

(12) Quick lime is CaO.

 On adding water to it large amount of heat is released, with the formation of Ca(OH)2

​  

 CaO + H2O → Ca (OH)  

(13) (i) sodium

           symbol => Na

           Latin name => Natrium

     (ii) Potassium

          symbol => k

          Latin name => Kalium

    (iii) Mercury

           symbol => Hg

           Latin name => hydrargyrum

​     (iv)  Iron

           symbol => Fe

           Latin name => Ferrum