Question

Rate of Motion
1 An object is dropped from rest and falls freely for 8 seconds.
a. Calculate the instantaneous speed (final velocity).
b. Calculate the average speed
C. Calculate the distance fallen
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Answer 1

u = 0 m/s (rest)

t = 8s

a = g = 10 m/s^2

a) v = u + at

v = 0 + 10 × 8

v = 80 m/s (inst. final velocity)

b) h = ut + 1/2 × gt^2

h = 0 + 5 × 64

h = 320 m --->[1]

Avg speed= total distance/total time

avg V = 320/ 8

avg V = 40 m/s

c) From eqn 1 we can say

distance, h = 320 m