Can someone please work out how to solve all three! I would really appreciate so

Question

Can someone please work out how to solve all three! I would really appreciate some help with these problems!

7. A ball is shot into the air off the ground with velocity v =-20 i +10 j (in m/s). The time the ball is in the air is (in seconds) and the launch angle are 1, tan1 (-1/2) b. 2, tan -1/2) c. 1, tan (-2) d. -1, tan (-1/2) a. 8. In problem 7, the x-component of the velocity at the top of the balls path at t (in m/s) a. 0 b. 2 C. -200 d. -20 9. A projectile is launched from the ground with an initial velocity of VO 10 m/s at an angle of 60° with respect to the horizontal. The y-component of velocity (in m/s) at a distance of 40 meters away is a. 10 cos(60) b. 10 cos(60) - 10(16) c. 10 sin(60) 10(4) d. 10 sin(60)- 10(8)

Explanation / Answer

solving 1st question

7)vertical velocity=10 m/s

time ball is in air=2v/g=2sec

launch angle=tan^(-1)(-1/2)

option b is correct

8

x component will not change as there is no acceleration in x direction

so -20

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