Question

A 2000kg car starting from rest attain a speed of 20m/s in 40 seconds. Find
the acceleration of the car.

Answer 1

GIVEN

A 2000kg car starting from rest attain a speed of 20m/s in 40 seconds.

TO FIND

Find the acceleration of car

SOLUTION

• Initial velocity (u) = 0
• Final velocity (v) = 20m/s
• Time taken (t) = 40s
• Acceleration (a) = ?

Apply formula

→ v = u + at

→ 20 = 0 + a*40

→ 20 = 40a

→ a = 20/40 = 0.5m/s²

Hence, the acceleration of car is

0.5m/s²

Answer 2

Aɴꜱᴡᴇʀ

☞ Acceleration = 0.5 m/s²

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Gɪᴠᴇɴ

◕ Weight of the car = 2000 kg

◕ Final velocity (v) = 20 m/s

◕ Time (t) = 40 seconds

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Tᴏ ꜰɪɴᴅ

➤ The acceleration of the body?

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Sᴛᴇᴘꜱ

❍ We shall here usne the first law of motion, that is,

$\large{\red{\underline{\boxed{\sf{v = u+at}}}}}$

So substituting the given values,

➳ 20 = 0 + a × 40

➳ 20 = 40 a

➳ $\sf\dfrac{20}{40}$ = a

➳ $\sf{\pink{a = 0.5 \:m/s{}^{2}}}$

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Some related formulas:-

✭ s = ut + ½ at²

✭ v²-u² = 2as

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Note:-

✪ The weight of the body has been given to make you confused.Here there is no use for that.

✪ Always see the given things and then equate it with the appropriate formula.

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