At maximum height , the velocity is zero . True

False

Answer and I will give you brainiliest
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true

Explanation:

The maximum height of a object in a projectile trajectory occurs when the vertical component of velocity, vy , equals zero. As the projectile moves upwards it goes against gravity, and therefore the velocity begins to decelerate. ... Once the projectile reaches its maximum height, it begins to accelerate downward.

v=u+at

15=10+a x 5

15-10= 5a

5= 5a

a=1 m/sec^2