If you find yourself in the scenario presented above, do not interfere. Just stay with the victim to make sure that he recovers. The coughing and the wheezing action of the victim will help him to clear his airways of the partial obstruction so that he can recover normal breathing.
Agree. Its okay to not be cheerful at times. Its actually healthy to show emotions.
While velocity is your speed, or how fast you are moving, acceleration refers to how your velocity is changing. For example, a negative acceleration means you are slowing down
Hope this helps
D is the answer, viruses can not be cure by antibiotics. Bacteria can.