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 horizontal component of the acceleration the instant after it is launched is .
•       The vertical component of the acceleration the instant after the projectile is launched is .
•       The horizontal component of the acceleration 1 second after it is launched is .
•       The vertical component of the acceleration 1 second after the projectile is launched is .
•       The horizontal component of the acceleration at maximum height is .
•       The vertical component of the acceleration at maximum height is .
•       The horizontal component of the acceleration 1 second before it lands on the ground is .
•       The vertical component of the acceleration 1 second before it lands on the ground is .
•       The horizontal component of the acceleration just before it lands on the ground is .
•       The vertical component of the acceleration just before it lands on the ground is

Explanation / Answer

The horizontal component of the acceleration the instant after it is launched is . Zero
•       The vertical component of the acceleration the instant after the projectile is launched is -9.8m/s2
•       The horizontal component of the acceleration 1 second after it is launched is zero
•       The vertical component of the acceleration 1 second after the projectile is launched is . -9.8m/s2
•       The horizontal component of the acceleration at maximum height is zero
•       The vertical component of the acceleration at maximum height is +9.8m/s2
•       The horizontal component of the acceleration 1 second before it lands on the ground is . zero
•       The vertical component of the acceleration 1 second before it lands on the ground is . +9.8m/s2
•       The horizontal component of the acceleration just before it lands on the ground is . zero
•       The vertical component of the acceleration just before it lands on the ground is +9.8m/s2

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