Question

please guys answer these questions..please give me an appropriate answers...and answer all the questions and i will mark u as brainliest and i want in 5 minutes as it is very urgent!!

Answer 1

3) from A to B t= 10 s v=50kmph= 13.8 m/s d= 13.8 *10 = 138m
and returns with v' = 100kmph= 27.6 m/s t'= 5 sec d'= 27.6*5= 138.0m
total distance covered = 276m
total displacement = 0m
average speed = total distance /total time = 276/15= 18.4 m/s
average velocity = total displacement /total time =0/15= 0m/s
4)the body starts moving from 0 ( rest ) I) d=3 and t=5s S=d/t= 3/5=0.6m/s
ii) since no distance is covered in time 5s to 7s , S=0\2= 0m/s
III) body moves 4 m in 2.sec S=d/t=4/2= 2m/s
5)
a) I) acceleration ii) uniform motion III) retardation
b) 40m/s
c) 3 sec to 5 sec A to B
d) in first 3 sec. acceleration is v/t = 30/3= 10m/s²
e) retardation is -v/t= - 40/3 = -13.3 m/s²
f) in first 5 seconds distance = area of triangle OAG + area of rectangle ABFG = 1/2 *30*3+30*2= 105m
hope it helps please mark as brainliest