Question

A 0.6 kg stone is thrown horizontally at a speed of 20 m/s from a 40-m-tall building (Let +x point in the direction the ball was thrown and +y point up).

A.

Determine the x component of the stone’s momentum the moment after it is thrown.

Express your answer in kilogram meters per second as an integer

B.

Determine the y component of the stone’s momentum the moment after it is thrown.

Express your answer in kilogram meters per second as an integer

C.

What is the x component of its momentum just before it hits the ground?

Express your answer in kilogram meters per second as an integer.

D.

What is the y component of its momentum just before it hits the ground?

Express your answer in kilogram meters per second as an integer

E.

What impulse did gravity impart to the stone?

Express your answer in kilogram meters per second as an integer

Answer 1

Solution:

a) * The concept which says that initial vertical component of velocity of an object is zero as it is thrown horizontally

*The expression for x-component of momentum the object is

b)* The expression for the y - component of initial momentum of the stone is

c)* The expression which relates vertical component of velocity, initial vertical components of velocity,

acceleration due to gravity and vertical displacement

d) The expression for y - component of momentum is

e) There is change in y component of momentum of stone due to gravity.

* Impulse imparted to the stone by the gravity is