Question

The velocity of a car changes from 50m/s to 20m/s in 60s .what is acceleration of car

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Answer 1

Using equation of motion

v = u + at

50 = 20 + 60*a

60*a = 50-20

60*a = 30

a = 30/60

a = 1/2 = 0.5 m²

Answer 2

Given :

• Final velocity (v) = 50 m/s
• Initial velocity (u) = 20 m/s
• Time (t) = 60 seconds

To find :

• Acceleration (a)

According to the question,

We will do this question by Newton's first equation of motion,

$\bullet \: { \boxed{ \bf \purple{v = u + at}}}$

$\bf \implies{50 = 20 + a \times 60} \\ \\ \bf \implies{50 - 20 = 60a} \\ \\ \bf\implies{30 = 60a} \\ \\ \bf \implies{ \cancel \dfrac{30}{60} \: \: \frac{1}{2} = a} \\ \\ \bf \implies { \frac{1}{2} = a } \\ \\ \implies { \underline{ \boxed{ \bf{0.5 = a}}}} \: \green \bigstar$

So,the acceleration is 0.5 m/s²..