- #1

richievuong

- 35

- 0

My work:

m1 = 1000kg

m2 = 2000kg

Ff = 1/4Fg

V1' = V2'

Fg = mg

=(1000)(9.81)

=9810N

Ff = 1/4Fg

= 1/4(9810)

=2452.5N

Fnet=Ff

P1(plane) = mv

= (1000)(50)

= 50000

P2(plane) = mv

= (1000)(0)

= 0

deltaP = (Fnet)t

50000 = 2452.5t

t = 20.387s

m1v1 + m2v2 = m1v1' + m2v2'

(1000)(50) + 2000(0) = 0 + (3000)v2'

50000 = 3000v2'

v2' = 16.667 m/s

a = V2-V1 / T

= (16.667-50) / 20.387

= -1.635m/s²

d = v1t + 1/2at²

= (50)(20.387) + 1/2(-1.635)(20.387)²

= 1019.35 - 339.777

=679.573m

Thats what i did but the answer is 340m...wondering what I did wrong...