14. An object starts from rest and is uniformly accelerated so that its speed is 60 m/s after 20s. If it travels with this speed for 40 s and is then brought to rest by a uniform retardation in 30 s.
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Answered by
0
Answer:
sorry
Explanation:
Can u say what should we find,the acceleration or speed or velocity?
Answered by
0
Correct option is
C
90 m
s=u×t+
2
1
×a×t
2
-------(1)
a=
t
v−u
-------(2)
where s is Distance travelled.
u is initial Speed.
v is final Speed.
a is Acceleration.
t is time.
Given : u=0,v=30
s
m
,t=6sec
a=
6
30
using equ. (2)
a=5
s
2
m
s=0+
2
1
×5×6
2
using equ. (1)
s=90m
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