Question

Ex.1 Calculate the force required to
impact to a car, a velocity of 30 m s-1
in 10 seconds. The mass of the car is
1,500 kg.
​

Answer 1

Question

Calculate the force required to impact to a car, a velocity of 30 m s-1 in 10 seconds. The mass of the car is 1,500 kg

Given

• $\tt \:†\: u_(initial\: velocity)=0$

【as the car starts from rest】

• $\tt †\:v_(final\: velocity)=30</li><li>\\ \tt †\:t_(Time)=10</li><li>\\ \tt †\:m_(mass)=1500$

Solution

• V = U + at

$\sf→ 30=0+a×10</p><p>\\ \sf→ 30=10a</p><p>\\ \sf→ a=3$

Now,

• F = ma

$\sf→ F=1500×3</p><p>\\ \sf→ F=4500\:N$

Hence

• The force required to impact the car is 4500N

Answer 2

Given :

• Velocity = $30\:m\:s^{-1}$

• Time = 10 seconds

• Mass = 1500 kg

To find :

• Calculate the force required to

impact to a car

According to the question :

⟶ Initial velocity of the car ( u ) = $0\:m\:s^{-1}$

⟶ Final velocity of the car ( v ) = $30\:m\:s^{-1}$

⟶ Time ( t ) = 10 s

⟶ Mass ( m ) = 1500

We know,

➳ v = u + at

⟹ 30 = 0 + a ( 10 )

⟹ a = $\bold{3\:m\:s^{-1}}$

We know,

➳ F = ma

⟹ 1500 × 3

⟹ 4500 N

So, It's Done !!