13. A man wearing a bullet-proof vest stands
on roller skates. The total mass is 80 kg. A
bullet of mass 20 g is fired at 400 m/s. It is
stopped by the vest and falls to the ground.
What is then the velocity of the man?
(a) 1 m/s
(b) 0.1 m/s
(c) 0.01 m/s
(d) 0 m/s
14. The unit of measuring the momentum of a
moving body is:
(a) m/s
(b) kgm/s
(c) kgm/s? (d) Nm²/kg
15. The inertia of a moving object depends on:
i. Mass of the object
ii. Momentum of the object
iii. Speed of the object
iv. Shape of the object
Choose the correct option:
(a) (i) and (ii)
(b) only (i)
(c) only (ii)
(d) (iii) and (iv)
f force is
Answers
Answer:
. A man wearing a bullet-proof vest stands
on roller skates. The total mass is 80 kg. A
bullet of mass 20 g is fired at 400 m/s. It is
stopped by the vest and falls to the ground.
What is then the velocity of the man?
(a) 1 m/s
(b) 0.1 m/s
(c) 0.01 m/s
(d) 0 m/s
14. The unit of measuring the momentum of a
moving body is:
(a) m/s
(b) kgm/s
(c) kgm/s? (d) Nm²/kg
15. The inertia of a moving object depends on:
i. Mass of the object
ii. Momentum of the object
iii. Speed of the object
iv. Shape of the object
Choose the correct option:
(a) (i) and (ii)
(b) only (i)
(c) only (ii)
(d) (iii) and (iv)
f force is
Explanation:
. A man wearing a bullet-proof vest stands
on roller skates. The total mass is 80 kg. A
bullet of mass 20 g is fired at 400 m/s. It is
stopped by the vest and falls to the ground.
What is then the velocity of the man?
(a) 1 m/s
(b) 0.1 m/s
(c) 0.01 m/s
(d) 0 m/s
14. The unit of