Question

a
dog jumps onto a toy at a 45° angle. At the top of the dog's motion
is the speed zero? and is the acceleration zero?

Answer #1

**Ans****: Speed = 0 ,
Acceleration g = 9.8 m/s² , in downward
direction.**

**Explanation:**

*The dog jumps with an initial velocity and and as it moves
upward it's velocity decreases and at highest point of it's
trajectory , i.e. when it reaches the maximum hight , the velocity
will be zero and then it will fall from highest point and speed
increases. So at the top of the dog's motion , the speed is
zero.*

*Now at the top , the speed is zero.i.e the dog stops for a
moment and at that point , there will the acceleration due to
gravity which will act on the dog in downward direction. But
horizontal acceleration is zero.*

*So , at the top of the dog's motion , acceleration will not
be zero but it will be g = 9.8 m/s².*

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