Question

9. A cricket ball of mass 200 g is moving with
speed of 180 km/h. It is reflected back with
the same speed. What is the impulse applied
on it?
a) 84 kg ms-
c) 30 kg ms-
b) 38 kg ms
d) 34 kg ms!
-1
10​

Answer 1

Answer:

Explanation:

m=200mg or 0.2 kg

v= 15m/s

t=0.05s

we know that F=ma

so,F=0.2*v/t

F=0.2*15/0.05=60N

Mass is m=500g which is equal to 0.5 kg

Initial velocity is u=36km/hr

Coverting into m/s

36×5/18= 10m/s

Final velocity=v=-10m/s

-10 because it is reflected with the same speed (it is in the opposite direction)

Impulse=m(v-u)

=0.5×(-10-10)

=0.5×(-20)

=-10 Ns