Question

1. State the meaning of recoil velocity of a gun.
2. Mass of a body is doubled. How does its acceleration change under a given force?

Answer 1

1.Recoil velocity is the speed with which the rifle or pistol recoils when the bullet is fired. ... Since the gun is many times heavier than a bullet, the recoil acceleration (and peak velocity) is many times less than the bullet (and powder) acceleration (and peak velocity).
2.We know,
F = ma
=> a = F/m
So, when mass is doubled keeping the force constant,
a = F/(2m) = a/2
Acceleration becomes half.

Answer 2

Answer:

New acceleration will be half of original acceleration

Given-

Mass of a body is doubled

To Find-

How does its acceleration change under given force

Formula Applied-

F=ma

Solution-

Force for a body of mass , m with acceleration a is given by ,

F = ma

a = F/m....(1)

When mass of a body is doubled , we need to find how acceleration changes under given force ,

⇒ m' = 2m

⇒ a' = ?

⇒ F' = F

Since , same force acting

Apply formula ,

F = ma

F' = m'a'

(F) =(2m)a'

F = 2a'm

a' = 1/2(F/m)

a' = 1/2(a) [from (1)]

a' = a/2

So , new acceleration will be half of original acceleration

Explanation:

hope it helps