Answer:
35 kg
Explanation: Newton's Second Law of Motion reinterpreted as
or 
These are some potential dangers of synthetic drug abuse
vf² = vi² + 2ad
vf = vi +at
vf = final velocity
vi = initial velocity
decelerated = a = - (negative)
a. stop ⇒ vf = 0
vf = vi+at
0 = 20 - 1.5t
1.5t=20
t = 13.3 s
b. vi = 20 m/s
0 = 20² - 1.5d
1.5d = 20²
1.5d = 400
d =266.67 m
c. d = vi.t -1/2at²
d = 20.3 - 1/2.1.5.3²
d = 53.25 m
Hey wats there answerssssssssssssss need it nowwwwwwww ASAP !!!!!!!