A projectile is launched from ground level with an initial velocity of 20 m/s at

Question

A projectile is launched from ground level with an initial velocity of 20 m/s at an angle of 40º above the horizontal (use g = 10 m/s2; choose positive direction up)

•       The vertical component of the acceleration the instant after the projectile is launched is [b].
•       The vertical component of the acceleration 1 second after the projectile is launched is [d].
•       The vertical component of the acceleration at maximum height is [f].
•       The vertical component of the acceleration 1 second before it lands on the ground is [h].
•       The vertical component of the acceleration just before it lands on the ground is [j].

Explanation / Answer

acceleartion for a projectile is always 9.8 m/s^2 donwards.

that is constant for all the time.

hence answer to all parts.

ay = 9.8 m/s^2 downward Or - 9.8 m/s^2

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