CBSE Class 11-science Answered
a particle is projected from ground with an initial velocity of 20 m per sec at an angle of 30 degree with the horizontal. wht is magnitude of change in 0.5 sec?
Asked by dharya21 | 03 Jul, 2010, 12:00: AM
Given, u = 20 m/s
θ = 300
Assuming that your question was about change in magnitutde of Velocity, we can say
ux = u cosθ = 20xcos30 = 20x
= 10
m/s


uy = u sinθ = 20xsin30 = 20x1/2 = 10 m/s
ax = 0 m/s2
ay = -g = -10 m/s2
Now change in velocity after 0.5 seconds is,
vx = ux + axt = 10
+ 0 = 10
m/s


vy = uy + ayt = 10 + (-10x0.5) = 10-5 = 5 m/s
So, the magnitude of final velocity after 0.5 seconds is, v = 

therefore, v = 

= 

= 

= 18.03 m/s
Team,
Topper Learning
Answered by | 19 Jul, 2010, 11:32: AM
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