A football of mass 0.4 kg at rest acquires a speed of 20 m/see when kicked. What is the
impulse imparted to ball?
A) 4 N. sec
C) 2 N see
B) 5 N. sec
D) 8 N sec
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1
Answer:
option d 8 N
Explanation:
mass of football =0.4kg
initial velocity of ball =0............(balls at rest)
final velocity of ball =20m\s
therefore acceleration=finalvelocity- initialvelocity
-------------------------------------
time
A= 20-0
------ =20
1
acceleration= 20 m/s^2
Force = mass x acceleration
force = 0.4 x 20.
= 8Newton
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