A ball is thrown with an initial speed of 20 m/s at an angle of 60\" to the grou

Question

A ball is thrown with an initial speed of 20 m/s at an angle of 60" to the ground. If air resistance is negligible, what is the balil's speed at the instant it reaches its maximum height from the ground? A Zero B 10 m's 2. C 14 m/s D 17 m/s E) 20 m/s For which of the following motions of an object must the acceleration always be zero? I. Any motion in a straight line II. Simple harmonic motion II. Any motion in a circle A Ionly B 11 only C IlIl only D Either I or II, but not I 3. None of these motions guarantees zero acceleration.

Explanation / Answer

here,

initial speed , u = 20 m/s

theta = 60 degree

at the maximum height

the vertical speed is zero

the ball's speed at the instant its maximum height from the ground, v = u * cos(theta)

v = 20 * cos(60) m/s

v = 10 m/s

the ball's speed at the instant its maximum height from the ground B) 10 m/s

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