Question

When a bullet of mass 20g moving with a speed of 50m/s the kinetic energy is​

Answer 1

Answer:

K.E. of the bullet is 25 J

Answer 2

Answer:

2250N

Explanation:

Mass =20 g=0.02 kg

Initial velocity (u)=150 ms

−1

Final velocity (v)=0 ms

−1

Distance travelled before coming to rest (s)=10 cm=0.1 m

v

2

=u

2

−2as

⇒0=(150)

2

−2⋅a⋅0.1=112500 ms

−2

f=ma

⇒f=0.02×112500 =2250 N