State which of following situations are possible and give an example for each of these: (a) an objec

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7. MOTION

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State which of the following situations are possible and give an example for each of these:

$(a)$ an object with a constant acceleration but with zero velocity

$(b)$ an object moving with an acceleration but with uniform speed.

$(c)$ an object moving in a certain direction with an acceleration in the perpendicular direction.

Option A

Option B

Option C

Option D

Solution

$(a)$ Possible

When a ball is thrown up at maximum height, it has zero velocity, although it will have constant acceleration due to gravity, which is equal to $9.8\,m/s^2$.

$(b)$ Possible

When a car is moving in a circular track, its acceleration is perpendicular to its direction.

Standard 9

Science

Abdul, while driving to school, computes the average speed for his trip to be $20 \,km\,h^{-1}$. On his return trip along the same route, there is less traffic and the average speed is $40\, km \,h^{-1}$. What is the average speed(in $km\,h ^{-1}$) for Abdul's trip?

hard

A bus starting from rest moves with a uniform acceleration of $0.1\, m s^{-2}$ for $2\,min$. Find $(a)$ the speed acquired, $(b)$ the distance travelled.

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An athlete completes one round of a circular track of diameter $200\, m$ in $40\, s$. What will be the distance covered and the displacement at the end of $2 \,min$ $20 \,s$ ?

hard

Fig shows the distance-time graph of three objects $A$, $B$ and $C$. Study the graph and answer the following questions :

$(a)$ Which of the three is travelling the fastest ?

$(b)$ Are all three ever at the same point on the road ?

$(c) $ How far has $C$ travelled when $B$ passes $A$ ?

$(d)$ How far has $B$ travelled by the time it passes $C$ ?

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What can you say about the motion of an object whose distance-time graph is a straight line parallel to the time axis ?

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Solution

Similar Questions

Abdul, while driving to school, computes the average speed for his trip to be $20 \,km\,h^{-1}$. On his return trip along the same route, there is less traffic and the average speed is $40\, km \,h^{-1}$. What is the average speed(in $km\,h ^{-1}$) for Abdul's trip?

A bus starting from rest moves with a uniform acceleration of $0.1\, m s^{-2}$ for $2\,min$. Find $(a)$ the speed acquired, $(b)$ the distance travelled.

An athlete completes one round of a circular track of diameter $200\, m$ in $40\, s$. What will be the distance covered and the displacement at the end of $2 \,min$ $20 \,s$ ?

What can you say about the motion of an object whose distance-time graph is a straight line parallel to the time axis ?

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