Question

QUESTION 1 Linear Motion
(a) A small coin is dropped from the height of the Spire in Dublin's city centre, a height of 120 metres.
(i) Calculate the speed of the coin just bạfore it hits the ground. Be sure to show all your work.
(ii) Is your calculated speed realistic? Explain your answer.
Explain the answer please

Answer 1

Answer:

48.51ms / 174.6 km/h

Explanation:

y = 1/2 x g x t^2         v = g x t          

when y = 120m

120 = 1/2 x 9.8 x t^2

t^2 = 24.49

t = 4.95s

when t = 4.95s

v = 9.8 x 4.95

v = 48.51 m/s = 174.6 km/h

I'd say its realistic. But I don't really know that sry