Question

What force will change the velocity of a body of mass 2kg from 20m/s to 40 m/s in 4s? * (1 Point) 1. 10 N 2. 30 N 3. 40 N 4. 5N​

Answer 1

Answer:

5N

Explanation:

From newton's second law,F=dtdP

dP= d(mv) 

So, required force F=21(30−20)N

so F=5N

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Answer 2

Explanation:

Let's solve this,

Given,

Mass=2kg

change in velocity(40-20)= 20m/s

Time= 4sec

Force=?

As we know,

a=(change in velocity)/time

a=20/4

a=5m/s²

Now again, we know,

Force = m.a

= 2× 5

=10N

so, the correct option is 1)