Question

A watch a second hand 2 cm long. Calculate :
i) the speed of the tip of the second hands
ii) the velocity of the tip at t=0 and t=15 seconds.
iii) change in velocity from t=0 to t=15 seconds.

Answer 1

Answer:

Explanation:

It's average velocity will be zero as there will be no displacement after one rotation. But if you are asking about the speed then here is your solution :-

Distance travelled by tip in one rotation = 2pi*r

= 2 * 22/7 * 2 = 88/7 cm

Time = 1 min = 60 seconds

So, Speed = 88/(60*7) = 88/420 cm/sec = 0.209 cm/sec or 0.21 cm/sec

Answer 2

Answer:

I think option 2 is correct