Question

3. A force F stop a body of mass m moving with a velocity v in a distance x.
The force required to stop a body of double the mass moving with double
the velocity in the same distance is
​

Answer 1

Answer:

2f

Explanation:

Correct option is

C

2F

First case

Apply energy conservation theorem

△w=△kE

F.d=

2

1

mv

2

−

2

1

mv

2

=0−

2

1

mv

2

FS=−

2

1

mv

2

__(1)

Second case

△w=△KE

F

1

.d=0−

2

1

(2m)v

2

F

1

d=−mv

2

From equation (i)

F

1

.d=2F.S

Now

d=S

F

1

=2F