Question

The author of a textbook starts to describe the motion of an object thrown horizontally from a cliff in the following way. " The horizontal velocity and the vertical velocity of the objects motion are independent and ....'

A) Explain the meaning of the three phrases printed in italics.
B) State how the two velocities mentioned would vary as the object fell.
C) If the object described above is thrown horizontally at 15ms-1 and the vertical Cliff is 80 m high calculate:
I) the time taken for the object to reach the ground
ii) The distance from the foot of the cliff to where the object strikes the ground.
Use g= 10ms-2

Answer 1

Hope I helped!`

Step-by-step explanation:

A) The phrase "horizontal velocity" refers to the speed at which the object is moving horizontally, while the phrase "vertical velocity" refers to the speed at which the object is moving vertically. The phrase "independent" means that one velocity does not affect the other.

B) The horizontal velocity would remain constant, while the vertical velocity would increase due to the acceleration due to gravity.

C)

I) The time taken for the object to reach the ground can be calculated using the equation:

t = sqrt(2h/g)

where h is the height of the cliff and g is the acceleration due to gravity (9.81 m/s^2). Plugging in the values, we get:

t = sqrt(2*80/9.81) = 4.04 seconds

ii) The horizontal distance traveled by the object can be calculated using the equation:

d = vt

where v is the horizontal velocity and t is the time taken for the object to reach the ground (which we calculated in part I). Plugging in the values.