Question

A body covers a semicircle of radius 7cm in 5 seconds. Find its linear speed

Answer 1

Answer:

4.4 cm / sec

Step-by-step explanation:

Distance

= half circumference of circle with radius 7cm

= half of 2 π r, with r = 7cm

= π × 7 cm

≈ 22 cm

Speed

= distance / time

= 22 cm / 5 sec

= 4.4 cm / sec

Answer 2

distance= circumference of circle ×1\2

so, pi r where r=7cm

pi×7 cm

22cm

speed=distace/time

so,distance=22

time=5 sec

22/5

=4.4cm/sec

HOPE IT HELPS YOU