# Doubt from kinematics

#1

Question 12 and 13 i am getting answer as 2m/s and 46.47m/s for 12 and 13 respectively but answer key says zero and 32.8 m i am correct or wrong ?

#2

In Question 12 Net displacement is zero. So Average velocity is also zero. See the formula of average velocity you will realise it.

#3

I think that in q13 data is not consistent as i'm getting two diffrent answers from two diffrent methods.

#4
#5

Question no 2,5and 10

#6
#7
#8

Question no 3 and 6

#9

Question 5,6 and 7

#10
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#11

Thank you very much

#12

For QUES 3 my answer is coming this is it correct?

#13

Your time is correct but final speed at hitting the wall isn't right. You have written - v = u.cos60 - 10×t BUT there is no acceleration in horizontal direction. The horizontal component remains same as of initial velocity while only vertical component changes because of gravitational acceleration.

#14

Your speed of projection seems correct as answer is 22.1 m/s and your calculation corresponds to 22.06m/s but your velocity calculation seems incorrect as answer is 13.7m/s but your calculation corresponds to 22.7 m/s

#15

Thanks sir i got it

#16

Then what will be the expression for b part