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vivado [14]
3 years ago
8

A man kicks the 150-g ball such that it leaves the ground at an angle of 60° and strikes the ground at the same elevation a dist

ance of 12 m away (14 points). Determine: (a). The velocity of the ball instantly after the man kicks the ball; (6 points) (b). Determine the impulse of his foot on the ball at A. (8 points) Neglect the impulse caused by the ball’s weight while it’s being kicked.
Physics
1 answer:
egoroff_w [7]3 years ago
3 0

Answer:

313.92\ \text{m/s}

47.088\ \text{kg m/s}

Explanation:

m = Mass of ball = 150 g

\theta = Angle of kick = 60^{\circ}

x = Displacement of ball in x direction = 12 m

Range of projectile is given by

x=\dfrac{u\sin^2\theta}{2g}\\\Rightarrow u=\dfrac{2xg}{\sin^2\theta}\\\Rightarrow u=\dfrac{2\times 12\times 9.81}{\sin^260^{\circ}}\\\Rightarrow u=313.92\ \text{m/s}

The velocity of the ball instantly after the man kicks the ball is 313.92\ \text{m/s}

Impulse is given by

J=mu\\\Rightarrow J=0.15\times 313.92\\\Rightarrow J=47.088\ \text{kg m/s}

The impulse of his foot on the ball is 47.088\ \text{kg m/s}.

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