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

Distinguish between speed and velocity.

easy

A motorboat starting from rest on a lake accelerates in a straight line at a constant rate of $3.0\, m s^{-2}$ for $8.0 \,s$. How far does the boat travel (in $m$) during this time ?

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A bus decreases its speed from $80\, km\, h ^{-1}$ to $60 \,km\, h ^{-1}$ in $5\, s$. Find the acceleration(in $m / s ^{2}$) of the bus.

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A ball is gently dropped from a height of $20\, m$. If its velocity increases uniformly at the rate of $10\, m s^{-2}$, with what velocity will it strike the ground? After what time will it strike the ground ?

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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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Solution

Similar Questions

Distinguish between speed and velocity.

A motorboat starting from rest on a lake accelerates in a straight line at a constant rate of $3.0\, m s^{-2}$ for $8.0 \,s$. How far does the boat travel (in $m$) during this time ?

A bus decreases its speed from $80\, km\, h ^{-1}$ to $60 \,km\, h ^{-1}$ in $5\, s$. Find the acceleration(in $m / s ^{2}$) of the bus.

A ball is gently dropped from a height of $20\, m$. If its velocity increases uniformly at the rate of $10\, m s^{-2}$, with what velocity will it strike the ground? After what time will it strike the ground ?

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