Question

1. A moving object with a mass of 8.8 kg has linear momentum of magnitude 13 kg mis. What is the kinetic energy of

the object?
a) 19 )
b) 4.8
c) 9.63
d) 0.743
e) 38)

Answer 1

Answer: Option C) 9.63 joules

Step-by-step explanation:

Mass of object = 8.8kg

Speed of object = ?

Kinetic energy = ?

Momentum of the object = 13 kgm/s

Recall that momentum is a product of mass M and speed V of a moving object.

Thus, Momentum = Mass x Speed

13 kgm/s = 8.8kg x V

V = (13kgm/s ➗ 8.8kg)

V = 1.48 m/s

Now, that the speed of the object is known, calculate its kinetic energy. And, its kinetic energy depends on its mass M and speed, V

Thus, Kinetic energy = 1/2 x mv^2

= 1/2 x 8.8kg x (1.48m/s)^2

= 0.5 x 8.8kg x (1.48m/s)^2

= 4.4 x (1.48m/s)^2

= 9.63 joules

Thus, the kinetic energy of the object is

9.63 joules