B. Chemical change,new substances were formed
Frequency = 1/time period = 1/0.05 = 20s^-1.
S= 1/2 x 182 x t = 1688.3
t = 1688.3 / 91
time = 18.55 seconds
Let the initial velocity be u = 23 m/s
Let the final velocity be v.
Vehicle stops finally, therefore v = 0 m/s
Here during the braking, vehicle decelerates with constant acceleration, thus the change in velocity is linear from initial velocity to final velocity.
for the Given condition:
Write the expression for the average speed
Substitute the values in the above expression.
Hence, the average speed during braking is 11.5 m/s
In
the 1980s, the campaign for homosexual rights received government support as Mel
Boozer, an openly gay running vice-presidency, gave a Democratic National
Convention speech at the same time Scotland legalized male to male sexual
behaviors. On 1981, the World Health Organization (WHO) removed homosexuality as
a mental illness.
<span>bullet In July, the Centers for Disease Control
reported that 26 cases of a very rare form of cancer, Kaposi's Sarcoma, was
found in young gay men. This was later recognized as being due to the presence
of AIDS.</span>