Question

Question 2.

A spherical ball of mass 10-6 kg hits a wall

1000 times per second normally with a experienced by the wall is

velocity of 1000 m/s and rebounds with same

velocity along the initial direction. The force

(a) 1 N

(b) 4 N

(c) 2 N

(d) 8 N
​

Answer 1

Answer:

c) 2N This is perfecta answer

Answer 2

OPTION (C) $2 \mathrm{~N}$

Step-by-step explanation:

$\mathrm{F}=\Delta \mathrm{P} / \mathrm{DT}$

ΔP = momentum

     = mΔv

m   = 10⁻⁶ kg

v    = 1000 m/s

ΔP ball = mΔv

            = 10⁻⁶ (-1000-1000)

            = 10⁻⁶(-2000)

            = -2× 10 ⁻³ kg m/s

ΔP wall = mΔv

            = -( ΔP ball)

            = 2× 10⁻³ kg m/s

ΔP        = 2× 10⁻³ ×( number of times hitting)

            = 2× 10³× 10⁻³

            = 2 kg m/s

            = 2 N