Question

The velocity of an object increases at a constant rate from 20 m s-1 to 50 m s' in 10 s. Find the acceleration.​

Answer 1

Initial velocity u = 20 m/s

Final velocity v = 50 m/s

Time taken T = 10 s

Acceleration = (v - u)/T

= (50 - 20)/10

= 30/10

= 3 ms^-2

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Answer 2

$\huge {\orange {\bf {\underline {\underline {AnSwer}}}:-}}$

➭ Gíven :-

➝ Initial velocity = 20 m/s

➝ Final velocity = 50 m/s

➝ Time taken to change velocity = 10s

➭ To fínd :-

➝ Acceleration of the object

➭ Solutíon :-

Using first equation of motion,

$\longrightarrow \bf v = u + at$

Where,

• v = final velocity
• u = initial velocity
• a = acceleration
• t = time taken

$\longrightarrow \sf 50 = 20 + a(10)$

$\longrightarrow \sf 50 - 20 = 10a$

$\longrightarrow \sf 30 = 10a$

$\longrightarrow \sf a = \cancel\frac{30}{10}$

$\longrightarrow \boxed{ \bf a = 3 {ms}^{ - 2} }$

Hence , acceleration of the object is 3m/s²