Options:
A.
B.
C.
D.
Sign in to view the correct answer and detailed explanation.
Study with fewer interruptions on Android
Use Ulearngo on a verified device for smoother past-question study.
Ulearngo is an independent study app. It is not affiliated with, endorsed by, or representing University of Ibadan (UI). Always confirm official exam, admission, registration, syllabus, timetable, and result information from UI official website, UI admissions.
Earlier discussion
3 older comments kept for context.
Bright
R=mg
=1.5×10
=15N
Coefficient of friction=F/R
0.7=F/15
F=0.7×15
=10.50N
So F=m×a
10.50=1.5×a
Therefore a=7m|s²
from eqtn of motion
V=at
20=7×t
t=2.857s
From 3rd eqtn
S=1/2gt²
Let your g be a
S=1/2at²
S=1/2×7×2.857²
S=29.15m
Mercy
The mass is 1500kg
ICE
15000.79.81= 10300
Work done by automobile
1/2mv^2
1/2150020*20= 300000
300000/10300= 29.1