can someone explain this question step by step please. i am not understing why w

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can someone explain this question step by step please. i am not understing why we are taking y= 2 at t=0 plz i need step by step solution thank you so much.

ourse Home Problem 4.12 yllabus cores e Text Study Area Document Sharing User Settings Course Tools -2.00 A physics student on Planet Exidor throws a ball and it follows the parabolic trajectory shown in the figure (Figure 1). The ball's position is shown at 1 s intervals until t-3 s. Att 1 s, the ball's velocity is i (2.0i +2.0j) m/s. Pre Correct Figure 1 of 1 PartE v = (2.0i + 2.0j) m/s What was the ball's la Express your answer 63.4° 2 s Correct 0 s Provide Feedback O Type here to search F6 8 5 6

Explanation / Answer

Part A

Let the acceleration due to gravity at the planet be g

In projectile motion, the horizontal component of velocity remains zero. Only vertical velocity changes

Therefore, horizontal component of velocity=2 m/s at all time

Let vertical velocity at 0 second be v

Vertical velocity at 2 seconds=0

Or, v=-2*g=-2g...(i)

Vertical velocity after 1 second=2 m/s

Or, 2=v+g*1=v+g...(ii)

From (i) and (ii), we get

g=-2 m/s²

v=-2g=-2*-2=4 m/s

Velocity at t=0 is 2i+4j

Part B

At 2 seconds, vertical velocity is zero

Therefore, velocity at 2 seconds=2i

Part C

Velocity at 3 seconds=2i-2j

Part D

Value of g as determined in part A=-2 m/s²

Part E

Ball's launch angle=arctan(4/2)=63.4 degrees

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