Question

two numbers are respectively 20% and 50% more than 13 number the ratio of the number is what

Answer 1

first number 13 , second number (13×120)/100, third number (13×150)/100
ratio = 13 : (13×120)/100 : (13×150)/100
= 1300 : 13×120 : 13×150
= 100:120:150 = 10:12:15

Answer 2

(1) Distance travelled in first 5 sec= area of ABDE= 20×s=80m

(2) Distance travelled after the brakes are applied (area of BCD)=

2

1

×8×5=20m

(3) Total distance travelled= AreaofABCDE+AreaofBCD=80+20=100m

(4) Acceleration during the first 5 sec= 0, because uniform velocity.

(5) Acceleration during the last 8 sec= v=0,u=20m/s,t=8sec

⇒v=u+at⇒0=20+a(8)

⇒a=−2.5m/s

2