13. If a ball is dropped from rest, it will fall 20 m during the first two seconds. How far will it
fall during the third and fourth seconds
a. 20 m
b. 30 m
c. 40 m
d. SO m
e. 60 m
Answers
Answered by
0
Answer:
Explanation:
Displacement
20
m
in first
2
sec
.
Apply kinematic equation
s
=
u
t
+
1
2
a
t
2
20
=
0
+
1
2
a
×
2
2
a
=
10
m
s
−
2
Displacement in
3
t
h
t
o
4
t
h
sec
S
4
−
S
3
=
1
2
a
(
t
2
2
−
t
2
1
)
=
1
2
×
10
(
4
2
−
3
2
)
S
4
−
S
3
=
35
m
Hence, ball dropped
35
m
in third to fourth second
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