Question

Calculate the force required to impact a velocity of 30m/s in 10s to a car .the mass of car is 1500kg​

Answer 1

$\huge\bold\star\red{Answer}$

When a car starts from the rest, its initial velocity is 0 and here its moving velocity is mentioned to be 30m/s.

So the difference in these two velocities is 30 – 0 = 30 m/s.

Hence, the acceleration of the car is calculated as this difference in velocities / time,

means here it is 30 / 10 = 3.

The formula for finding the force is acceleration x mass, i.e. 1500 x 3 = 4500 Newton......☹️☹️

Explanation:

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Answer 2

Given

• Initial velocity (u) = 0 {car starts from rest}
• Final velocity (f) = 30m/s
• Time (t) = 10s
• Mass (m) = 1500kg

To find

• Force = ?

Solution

As we know that

→ F = m(v-u)/t

→ F = 1500(30 - 0)/10

→ F = 1500 × 30/10

→ F = 4500N

Hence,

• Force = 4500N

Extra Information

• Force = mass × acceleration
• v = u + at {First equation of motion}
• s = ut + ½ at² {Second equation of motion}
• v² = u² + 2as {third equation of motion}
• Pressure = Force/Area