Question

An athlete running on circular track of radius 21m if he completes one round in 4mins. Find distance and displacement at end of 10mins

PLZ ANSWER...

Answer 1

radius of circular track = 21 m
Circumference = 2πr
=> 2 × 22/7 × 21
=> 44× 3
=> 132 m
132 meter = 4 min
1 min = 132/4 = 33 m
10 min = 33×10 = 330 min
hence the required distance covered in 10 min is 330 m and round covered is 2.5 .

Answer 2

distance cover in 10 mins = 2(pi)r

                                             2 X 3.14 x 21

                                             =131.88 m

displacement = 2r =diameter =21 x 2 = 42 m