A projectile is launched at 10 m/s in a direction 60 degrees above the horizonta

Question

A projectile is launched at 10 m/s in a direction 60 degrees above the horizontal. At maximum height, the horizontal velocity and horizontal acceleration of the projectile are, A. horizontal velocity = 0, horizontal acceleration = 0 m/s^2 B. horizontal velocity = 0, horizontal acceleration = -9.81 m/s C. horizontal velocity = 5 m/s, horizontal acceleration = 0 m/s D. horizontal velocity = 5 m/s, horizontal acceleration = -9.81 m/s^2 5. Two displacement vectors have magnitudes of 5.0 m and 7.0 m, respectively. If these two vectors are added together, the magnitude of the sum A. is equal to 2.0m B. could be as small as 2.0 m or as large as 12 m. C. is equal to 12 m. D. is equal to 8.6 m.

Explanation / Answer

4. Horizontal velocity is constant throughout.

vx = 10 cos60 = 5 m/s

and there is no acceleration in the horizontal direction.

Ans(C)

5.   

||A| - |B|| =< |A + B | =< |A| + |B|

C = |A + B|

C_min = 7- 5 = 2m

C_max = 7+ 5 = 12 m

Ans(B)

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