Answer:
Speed= 120 km/h
Velocity= 120 Km/h North
Explanation:
Time= 2.5 hours
Distance= 300 Km
Direction= North
Speed= distance/speed
Velocity= speed and direction
Substituting 300 km for speed and 2.5 hours for time then speed= 300/2.5= 120 km/h
The velocity= 120 km/h North
8935
When a ray of light falls on a glass slab normally, the angle between normal and incident ray is zero.
Consider the east-west direction along x-axis and north-south direction along y-axis. In unit vector notation, velocities can be given as
= velocity of car A before collision = 0 i - j
= velocity of car B before collision = i + 0 j
= velocity of combination after collision = (35.8 Cos31.6) i - (35.8 Sin31.6) j = 30.5 i - 18.8 j
= mass of car A = 1750 kg
= mass of car B = 1450 kg
Using conservation of momentum
+ = ( + ) ( )
(1750) (0 i - j) + (1450) ( i + 0 j) = (1750 + 1450) (30.5 i - 18.8 j)
(1450) i - (1750) j = 97600 i - 60160 j
Comparing the coefficient of "i" and "j" both side
(1450) = 97600 and - (1750) = - 60160
= 67.3 km/h and = 34.4 km/
1 is gas
2. a false
b. true
c. true
d. false
3. fig(3)