• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Mathematics: Post your doubts here!

Messages
263
Reaction score
746
Points
103
Can someone solve this? I got problem with these kind of questions
 

Attachments

  • Untitled.png
    Untitled.png
    67.6 KB · Views: 14
Messages
182
Reaction score
29
Points
38
which variant?
question 6
i) mew=0.3 so F=0.3*2=0.6
4.5-T=0.45a
T-0.6=0.2a solving them simultaneously you get a=3.9m/s^2
Height of B above ground =2-(2.8-2.1)=1.3m
v^2-u^2=2as
v^2-0=2*1.3*6 so v=3.95m/s
ii)s=ut+1/2 at^2
t^2=1.3*2/6
t=0.658
v=u+at
v=0+6(0.658)=3.948
-F=ma
-0.6=0.2a so a=-3
v^2-u^2=2as
v^2-3.948^2=2*-3*(2.1-1.3)
v=3.29m/s
 
Messages
2,211
Reaction score
1,261
Points
173
question 6
i) mew=0.3 so F=0.3*2=0.6
4.5-T=0.45a
T-0.6=0.2a solving them simultaneously you get a=3.9m/s^2
Height of B above ground =2-(2.8-2.1)=1.3m
v^2-u^2=2as
v^2-0=2*1.3*6 so v=3.95m/s
ii)s=ut+1/2 at^2
t^2=1.3*2/6
t=0.658
v=u+at
v=0+6(0.658)=3.948
-F=ma
-0.6=0.2a so a=-3
v^2-u^2=2as
v^2-3.948^2=2*-3*(2.1-1.3)
v=3.29m/s
bt y F=0.3*2??????
 
Messages
263
Reaction score
746
Points
103
(i) total work done = increase in KE + R
WD= 1/2m(v^2-u^2) + 5000
WD = 1/2*12500*(25^2-17^2) + 5000
WD = 2100000J+5000
WD = 2100KJ+5000
WD = 7100KJ
Hey why do they sometimes subtract R and sometimes its added. Im really confused
 
Messages
869
Reaction score
374
Points
73
(i) total work done = increase in KE + R
WD= 1/2m(v^2-u^2) + 5000
WD = 1/2*12500*(25^2-17^2) + 5000
WD = 2100000J+5000
WD = 2100KJ+5000
WD = 7100KJ
u misunderstood me i meant the second part, where u have to find the height :/
 
Top