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7. MOTION
medium
Distance$-$time graph below represents the motion of two buses $A$ and $B$
$(i)$ What is the distance by which bus $B$ was ahead of bus $A$ initially ?
$(ii)$ Do they ever meet each other ? If so, when ?
$(iii)$ What is the distance travelled by bus $A$ when it overtakes bus $B$ ?
$(iv)$ Find out the distance by which bus $A$ was ahead of bus $B$ at $y=12 h$
$(v)$ Which one of them is moving faster ? Give reason.
Option A
Option B
Option C
Option D
Solution
$(i)$ $20 km$
$(ii)$ Yes, they meet after $9$ hour.
$(iii)$ $60 km$.
$(iv)$ $80-70=10 km$
$(v)$ $A$ moves faster as its slope is higher than $B$.
Standard 9
Science
