Question

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Answer 1

Respuesta:

1)  2.5s

2) 12.5s, 187.5m

3) 0.13 m/s², 162.5m

4) 39m, 2.167 m/s²

Explicación:

1)  a = 12 m/s², V = 30 m/s, t = ?

   a = V/t   ∴  t = V/a = 30/12 = 2.5s

2) V₀ = 5 m/s, V = 25 m/s, a = 1.6 m/s², t = ?, d = ?

   a = (V-V₀)/t  ∴ t = (V-V₀)/a = (25-5)/1.6 = 12.5s

   d = V₀t + (1/2)at² = (5)(12.5) + 0.5(1.6)(12.5)² =62.5 + 125 = 187.5m

3) t = 50.45s, V = 6.5m/s, a = ?, d = ?

   a = V/t = 6.5/50.45 = 0.13 m/s²

   d = V²/2a = (6.5)²/2(0.13) = 162.5 m

4) V = 13 m/s, t = 6s, d = ?, a = ?,

   a = V/t = 13/6 = 2.167 m/s²

   d = V²/2a = (13)²/2(2.167 ) = 39m