Question

If a car of mass 900 kg stops from a speed of 90kmph in just 10 seconds, then the force responsible for stopping the car is _______ (in N)

Answer 1

Answer:

i think the answer will be 18000

Explanation:

pls check the answer of other people's

Answer 2

Answer :

➥ The force responsible for stopping the car = 2250 N

Given :

➤ Mass of a car = 900 kg

➤ Initial velocity of a car = 0 m/s

➤ Final velocity of a car = 90 km/hr

➤ Time taken by a car = 10 sec

To Find :

➤ Force responsible for stopping the car = ?

Required Solution :

✒ To find the force responsible for stopping the car, first we need to convert the final velocity of a car km/hr to m/s to convert the final velocity km/hr to m/s multiply the speed of value by 5/18, after we need to find the acceleration of a car, After all this we wil find the force responsible for stopping the car.

◈ Final velocity = 90 km/hr

→ Final velocity = 90 × 5/18

→ Final velocity = 450/18

→ Final velocity = 25 m/s

Now, we have Mass and Acceleration of a car,

• Final velocity of a car = 25 m/s
• Initial velocity of a car = 0 m/s
• Time taken by a car = 10 sec

We can find Acceleration of a car by using the first equation of motion which says v = u + at,

Here,

• v is the Final velocity in m/s.
• u is the Initial velocity in m/s
• a is the Acceleration in m/s².
• t is the Time taken in second.

✎ So let's calculate Acceleration (a) !

⇒ v = u + at

⇒ 25 = 0 + a × 10

⇒ 25 = 0 + 10a

⇒ 25 - 0 = 10a

⇒ 25 = 10a

⇒ 25/10 = a

⇒ 2.5 = a

⇒ a = 2.5 m/s²

Now, we have Mass and Acceleration of a car,

• Mass of a car = 90 kg
• Acceleration of a car = 2.5 m/s²

We can find force responsible for stopping the car by using the formula of force which says F = ma

Here,

• F is the Force in N.
• m is the mass in kg.
• a is the Acceleration in m/s².

✎ So let's find Force (F) !$\:$

⇛ F = ma

⇛ F = 900 × 2.5

⇛ F = 2250 N

║Hence, the force responsible for stopping the car is 2250 N.║