Question

Q1.A car moving with uniform acceleration attains speed of 36km/hr in 2 minutes find the acceleration ?

Answer 1

Explanation:

✬ Acceleration = 0.083 m/s² ✬

Explanation:

Given:

Initial velocity of car is 0.

Final velocity of car is 36 km/h.

Time taken to attain final speed is 2 minutes.

To Find:

What is the acceleration of car ?

Formula to be used:

v = u + at

Solution: First change the final velocity from km/h to m/s and also time to seconds.

[ To change km/h to m/s multiply by 5/18 ]

➙ Final velocity = 36(5/18) = 10 m/s.

[ 1 minutes = 60 seconds ]

➙ 2 minutes = 2(60) = 120 seconds.

Now, we have

v = 10 m/s.

u = 0 m/s.

t = 120 s.

⟹ v = u + at

⟹ 10 = 0 + a(120)

⟹ 10 = 120a

⟹ 10/120 = a

⟹ 0.083 m/s² = a

Hence, the acceleration of car is 0.083 m/s².

__________________

➟ The rate of change of velocity is called acceleration. It is denoted by a.

➟ The velocity at which motion starts is termed as initial velocity. It is denote by u.

➟ The last velocity of an object after a period of time. It is denoted by v.

Answer 2

Explanation:

• Initial Velocity u = 0
• Final Velocity v = 36 km/hr = 10 m/s
• Time t = 2 min = 120 sec
• Acceleration a = ?
• By 1st Equation of motion

$v \: = u \: + a \: t$

$10 = 0 + a \times 120$

$a \: = \frac{10}{120}$

$a \: = \frac{1}{12} = 0.083\: m {s}^{ - 2}$