position of a moving object varies as x =t^3 upon 3 + t^2+2 where X is in metre and T is in second speed of the object at t= 2S will be
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Answer:
Correct option is
C
15 m s
−1
Position is given as x=a+bt
2
=8.5+2.5t
2
Position at t=2 s, x
2
=8.5+2.5(2)
2
=18.5 m
Position at t=4 s, x
1
=8.5+2.5(4)
2
=48.5 m
Displacement S=x
2
−x
1
=48.5−18.5=30 m
Time taken t=4−2=2 s
Average velocity V
avg
=
t
S
=
2
30
=15 m/s
Explanation:
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