Question

A body of mass of 5kg is started from rest moves an acceleration of 4ms^-2.its momentum after 5s is
A)20kgms^-1
B)100kgm^-1
C)4kgm^-1
D) 9.8kgms^-1
note:dont put any silly questions ok if u answer the right one then i will follow u ok ​

Answer 1

PLEASE MARK ME BRAINLIEST

P = mv

P = 5 ( u + at)

P = 5 ( 0 + 4 x 5)

P = 5 (20 )

P = 100 kg m/s^-1

PLEASE MARK ME BRAINLIEST

Answer 2

Given :

• Initial velocity, u = 0 m/s (as it is started from rest)
• Acceleration, a = 4 m/s²
• Time, t = 5 seconds
• Mass of a body, m = 5 kg

To find :

• Momentum, p

According to the question,

➞ v = u + at

Where,

• v = Final velocity
• u = Initial velocity
• a = Acceleration
• t = Time

➞ Substituting the values,

➞ v = 0 + 4 × 5

➞ v = 0 + 20

➞ v = 20

• So,the velocity is 20 m/s.

As we know,

★ Momentum of a body can be defined as the product of mass and velocity.

So,

➞ Momentum = Mass × Velocity

Or,

➞ p = m × v

➞ p = 5 kg × 20 m/s

➞ p = 100 kg m/s

• So,the momentum is 100 kg m/s. Hence, option B) 100 kg m/s is correct.