Respuesta :
The correct answer is 39.2m
Initial speed=u=28m/s
Final velocity at maximum height=v=0m/s
a=g=10m/s
A) maximum height attained by stone=u²/2g=28×28/2×10=39.2m
B) time=t=u/g=28/10=2.8sec
t1=2.85−1=1.85
V=u+at
=28−(10)(1.85)=28−18.13=9.87m/s
Hence the velocity is 0.87 m/s
c) No it will not change .
Because after 1-sec final velocity becomes zero for any initial velocity.
What is velocity?
Velocity is defined as a vector measurement of the rate and direction of motion. Simply put, velocity is the rate at which something goes in one direction. The velocity of a car moving north on a major highway and the velocity of a rocket launching into space may both be measured.
As you may expect, the velocity vector's scalar (absolute value) magnitude represents the speed of motion. In calculus, velocity is the first derivative of position with respect to time. You can determine velocity using a simple formula that includes rate, distance, and time.
learn more about velocity refer:
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