I will mark as a brain list
please any one answer these 4 questions
Please
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1)From the equation of kinematics we have,
t=2usin(€)/g, where €=30°.
Also, 2=(40)/g=>g=20m/s².
2)u(y)=3m/s.
Then we have, tan€=3/4.
so, cos€=1/(√1+9/16)=4/5.=>sin€=3/5
Also, u=5m/s.
Then, h=[usin€]²/2g=9/20m.
....................
alternative:
h=(3)²/20=9/20m.
3)For this part only take the ratios of the angles.
So we get,
(sin70°):(sin110°)=1:1.
4)according to the condition,
v²=2gh=>h=400/20=20m.
Again we have, 20²×sin²€=2g×20
=>€=90°
Also, as observed this is not a projectile motion .
Then, 0=20-10t=>t=2s.
t=2usin(€)/g, where €=30°.
Also, 2=(40)/g=>g=20m/s².
2)u(y)=3m/s.
Then we have, tan€=3/4.
so, cos€=1/(√1+9/16)=4/5.=>sin€=3/5
Also, u=5m/s.
Then, h=[usin€]²/2g=9/20m.
....................
alternative:
h=(3)²/20=9/20m.
3)For this part only take the ratios of the angles.
So we get,
(sin70°):(sin110°)=1:1.
4)according to the condition,
v²=2gh=>h=400/20=20m.
Again we have, 20²×sin²€=2g×20
=>€=90°
Also, as observed this is not a projectile motion .
Then, 0=20-10t=>t=2s.
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