Question

In order to gain a velocity of 12m/s how long should a force of 30N be exerted on a body of mass 5kg?​

Answer 1

Given

• Change in velocity (v - u) = 12m/s
• Force (F) = 30N
• Mass (m) = 5kg

To find

• Time = ?

Solution

As we know that

→ F = (v - u)/t

→ t = m(v - u)/F

→ t = 5 × 12/30

→ t = 60/30 = 2s

Hence,

• Time = 2s

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

Answer 2

$\huge {\underline{\pink{Given:-}}}$

• Gain in velocity (v -u) = 12m/s

• Force (F) = 30N

• Mass of Body (M) = 5kg

$\huge {\underline{\pink{To Find:-}}}$

• Time (t)

$\huge {\underline{\pink{Solution:-}}}$

We know that Force is the product of mass and acceleration.

➲ Force = Mass × Acceleration

➲ F = M ×a

➲ F = M × (v-u/t) .............a = v-u/t

Putting all the values which is given above

➲ 30 = 5 × 12/t

➲ 30 = 60/t

➲ 30×t = 60

➲ t = 60/30

➲ t = 2 s

The Force should be exerted on the body for 2 second.