Question

5. A particle moves along a semicircle of radius 10 m in
5 seconds. The average velocity of the particle is
(a) 2π m s-1
(b) 4πm-1
(c) 2 m s-1
(d) 4 ms​

Answer 1

Explanation:

a particle moves along a semicircle of radius 10m in 5 seconds. the average velocity of the particle is what ? Answer: 4 m/sAverage velocity = Total Displacement / Time takenDisplacement = 2 x Radius = 2 x 10m = 20m. Time taken = 5s⇒Average velocity = 20/5 = 4 m/s.

Answer 2

Given,

Radius, r = 10m

Time, t = 5s

Solution,

Displacement, s = 2*pi*r*(1/2) = 20pi/2 = 10pi

Velocity, v = s/t = 10pi/5 = 2pi = 2*3.14 = 6.28 m/s