Question

two persons do the same amount of work. the first person does it in 10 Seconds and the second in 20 sec find the ratio of the power used by the person to that by the second person​

Answer 1

Let work done by both persons be W

Therefore,Power used by both will be p1 and p2 respectively

Therefore, Time taken by 1st person =10secs

Time taken by 2nd person =20secs

Formula =p=w/t

Therefore,

Let

p1=w/t1

p2=w/t2

Therefore,Taking ratios of both quantities we get

p1/p2 =w/t1/w/t2

p1/p2=t1/t2

Substitute the values we get final answer

p1/p2=1/2

Answer 2

Answer:

Work done=same

Power= work done/time taken

Power1/power2= work done1/time 1/work done2/time2=time2/time1=20/10=2/1