Answer:
<u>B. Should be rested</u>
Explanation:
That is the only reasonable answer.
Gravity slows the upward speed of any rising object by 9.8 m/s every second.
If the ball is tossed upward at 20 m/s, then it's at the top of its arc and its speed has dwindled to zero in (20/9.8) = 2.04 seconds.
During that time, its starting speed is 20 m/s and its ending speed is zero, so its AVERAGE speed all the way up is (1/2) (20 + 0) = 10 m/s .
Sailing upward for 2.04 seconds at an average speed of 10 m/s, the ball rises to (2.04 x 10) = <em>20.4 meters.</em>
D. a train on a straight track
Answer:
The correct answer is -
A) 
B) 
Explanation:
As it is mention that the spool has mass M, radius R and moment of inertia I. In the first part of the question as the spool is not moving and r < R which means there is net torque = 0
so, 
and
In the second part of the question from the given information, we can express the angular acceleration
= ( alpha = angular acceleration and a = translational acceleration)
First what is an equivalent angle for 310 degrees rotated counter clockwise? -50 degrees. so we're in the fourth quadrant. meaning X must be positive and Y must be negative.
use your sine and cosine functions to get the answers now. we know sine relates to Y so use 37sine(-50) equals about -28.3
cosine relates to X so use 37cos(-50) equals about 23.8
