Question

For how long should a force of 20 newton acts on a body of mass 20 kg so that it acquires velocity of hundred metre per second

Answer 1

Answer:

100 seconds

Explanation:

• Force = 20 N
• Mass = 20 kg

From Newton's second law

Acceleration = Force / Mass

= 20 N / (20 kg)

= 1 m/s²

Now, use equation of motion

• v = u + at

Where

• v = Velocity after time "t'
• u = Velocity when "t = 0"
• a = Acceleration of body
• t = Time taken for the body to change its velocity from "u" to "v"

t = (v - u)/a

= (100 m/s - 0 m/s) / (1 m/s²)

= 100 s

Answer 2

$\large\blue{heya mate!!}$

Force = 20 N

Mass = 20 kg

From Newton's second law

Acceleration = Force / Mass

= 20 N / (20 kg)

= 1 m/s²

Now, use equation of motion

v = u + at

Where

v = Velocity after time "t'

u = Velocity when "t = 0"

a = Acceleration of body

t = Time taken for the body to change its velocity from "u" to "v"

t = (v - u)/a

= (100 m/s - 0 m/s) / (1 m/s²)

= 100 s