Question

A body at rest starts moving with a velocityof 25m/sec when accelerated after 5 sec. calculate acceleration​

Answer 1

Answer:

Given

• initial velocity= 0m/sec
• final acceleration= 25/m/sec
• Time = 5 sec

To find

• acceleration= ?

Formula Used

$⇝\bold\pink{v=u+at}$

Solution

~Here the concept of "motion in straight line" is used. The body starts with 0 velocity and gains the final velocity of 25 m/sec in 5sec. We can find the acceleration gained by motion's 1st equation of motion.

~We know that Motion's 1st equation is

${\underline{\boxed{\sf{\color{grey}{v=u+at}}}}}$

where

• v denotes final velocity
• u denotes inital velocity
• a denotes acceleration
• t denotes time

Súbsitúte the values

$\sf{\implies 25=0+a×5}\\ \\ \sf{\implies 25= 5a}\\ \\ \sf{\implies a= \frac{25}{5}}\\ \\ \sf{\implies \red{a=5m/sec²}}$

Therefore the acceleration is 5m/sec².

• Acceleration is defined as the rate of change of velocity.
• It's S.I unit is m/sec².
• It is a vector quantity.

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More to know !!

$\sf{☂ s= ut+\frac{1}{2}at²}$

$\sf{☂ v² = u² + 2as }$

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