Question

7. In an experiment to measure the speed of a moving ball, it is observed that the ball
covers a distance of 5 m and 20 cm in 4 seconds before it comes to a stop. Calculate the
speed of the ball in m/s.
train in m/s.​

Answer 1

${\large{\pmb{\sf{\underline{Required \: SoluioN...}}}}}$

${\bigstar \:{\pmb{\sf{\underline{Understanding \:the \:question...}}}}}$

⋆ Correct question: In an experiment to measure the speed of a moving ball, it is observed that the ball covers a distance of 5 m and 20 cm in 4 seconds before it comes to a stop. Calculate the speed of the ball in m/s.

⋆ Understanding the question: This question says that we have to calculate the speed of the ball in that is ${\sf{m/s}}$ or ${\sf{ms^{-1}}}$ when an experiment take place to measure that the speed of a moving ball. While observing it is observed that the ball covers a distance of 5 metres 20 centimetres in 4 seconds before it comes to a stop.

${\bigstar \:{\pmb{\sf{\underline{Given \: that...}}}}}$

⋆ Distance cover by a ball = 5 m 20 cm

⋆ Time taken by the ball = 4 seconds

${\bigstar \:{\pmb{\sf{\underline{To \: find...}}}}}$

⋆ Speed of the ball

${\bigstar \:{\pmb{\sf{\underline{Solution...}}}}}$

⋆ Speed of the ball = 1.3 m/s

${\bigstar \:{\pmb{\sf{\underline{Using \: concept...}}}}}$

⋆ Formula to find speed

⋆ Formula to convert cm into m

${\bigstar \:{\pmb{\sf{\underline{Using \: formula...}}}}}$

⋆ Speed = Distance/Time

⋆ 1 m = 100 cm ; 1 cm = 1/100 m

${\bigstar \:{\pmb{\sf{\underline{Full \; Solution...}}}}}$

~ As it's given that we have to find out the speed of the ball in m/s so firstly let us convert the centimetres into metres

⇒ 1 cm = 1/100 m

⇒ 20 cm = 20/100 m

⇒ 20/100 (Cancelling)

⇒ 2/10 (Cancelling)

⇒ 1/5

⇒ 0.2 metres = 20 centimetres

~ Now let's convert whole distance into metres. Let's do it!

⇒ 5m 20cm

⇒ 5m 0.2m

⇒ Distance = 5.2 metres

~ Now let's use the formula to find speed and let's find the final solution!

⇒ Speed = Distance/Time

⇒ Speed = 5.2/4 (Cancelling)

⇒ Speed = 2.6/2 (Cancelling)

⇒ Speed = 1.3/1

⇒ Speed = 1.3 m/s

${\large{\pmb{\sf{\underline{KnoW \: More...}}}}}$

★ Distance = It is the length of actual path covered by a moving object in a given time interval.

★ Displacement = Shortest distance covered by a body in a definite direction is called displacement.

→ Displacement may be positive, negative or zero whereas distance is always positive.

→ Distance is a scaler quantity whereas displacement is a vector quantity both having the same unit.

→ In general magnitude of displacement ≤ Distance.

★ Speed = Distance travelled by a moving object in unit time interval is called speed i.e., speed Distance/Time. It's scaler quantity and it's SI unit is metre/second

★ Velocity = Velocity of moving object is defined as the displacement of the object in unit time interval i.e., velocity = Displacement/Time. It's vector quantity and it's SI unit is metre/second.

★ Acceleration = Acceleration of an object is defined as the rate of change of velocity of the object i.e., Acceleration = Change in velocity/Time. It's vector quantity and SI unit is m/s²

Answer 2

Answer:

130cm/s

Explanation:

distance is equal to 5 m 20cm equal to 5.2 m

time is equal to 4 s

we know that speed is equal to distance by time

therefore speed= 5.2 m / 4 s = 1.3 m/s