4 years ago

A rock breaks off a cliff and falls from rest. How fast is the rock moving after 1.23 sec?

Physics

1 answer:

Whitepunk [10]4 years ago

6 0

I have no idea then if I was wrong.

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If you know that the rock fell 4.9 m in 1 s , how far did it drop in the first 0.5 s after you dropped it?

klio [65]

When an object is free-falling, no other force is acting upon it but the gravitational force. Because of this, the equations of motion are simplified. We can determine first the initial velocity:

v = √2gy = √2(9.81)(4.9) = 9.805 m/s

Then, we use this to the equation below:
y = vt + 1/2*at²
y = (9.805)(0.5) + 1/2(9.81)(0.5)²
y = 6.13 m

7 0

4 years ago

Read 2 more answers

You drive 4 km at 30 km/h and then another 4 km at 50 km/h. What is your average speed for the whole 8-km trip?

Setler79 [48]

Answer:

option A

Explanation:

given,

drive 4 km at 30 km/h and

another 4 km at 50 km/h

average speed for the whole 8 Km trip = ?