Question

4. A shot put player thrown a
shot-put of mass 3 kg. if it
crosses the top of wall of 2m
high at a speed of 4 m/s .
compute mechanical energy *
78.67J
64.21J
81.78J
O 82.85J​

Answer 1

Answer:

$\bigstar GIVEN:$

• Mass (m) = 3 Kg.
• Height (h) = 2m.
• Speed (v) = 4ms⁻¹.
• Acceleration due to gravity (g) = 9.806ms⁻¹.

$\bigstar SOLUTION:$

$M.E = K. E + P.E. \\M.E. = \frac{1}{2} mv^2 + mgh$

Where M.E. = Mechanical energy, P.E = Potential energy, K.E. = Kinetic energy.

Substitute the values.

$M.E. = \frac{1}{2} \times 3 \times 4^2 + 3 \times 2 \times 9.806$

$M.E. = 24 + 58.836$

$M.E. = 82.836J$

$M.E.=82.85J \: \: [Rounded \: \: off \: \: to \: \: the \: \: nearest \: \: decimal]$

OPTION D IS CORRECT.

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