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 ?

# Doubt from kinematics

**Ankith_2020**#2

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

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

**Vaibhav_1**#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.

**abhijit_2020**#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