4. If you lift a 30 kg weight 0.5 meters. How much Potential energy has it
gained?
Note:- Use g = 10 m/s?
a 150 J
b 60 J
C 180 J
d 100 J

150 J

Explanation:

here, m= 30kg

height = 0.5 m

so

potential energy = mgh

= 30×10×0.5= 30×5

= 150 J

hello, i am papaguy.

i have found an answer to your question but use it as information.

information: because weak acids/bases have low concentration of hydrogen ions, the addition of water has a large impact on the ph. 2. a difference in 1 unit is a 10x difference in concentration for example; a liquid with ph of 3 is 10x more acidic than a liquid with a ph of 4. therefore, a liquid with a ph of 3 is stronger.

best of luck!

no. dot product   =0 when vecs at right angles