Question

Toss a ball upward with an initial speed of 10 m/s. Neglecting air resistance, the time it takes to reach its release point is about
(a) 4 s (b) 1 s (c) 3 s (d) 2 s

Answer 1

Question #60703, Physics – Mechanics | Relativity

Toss a ball upward with an initial speed of $10 \, \text{m/s}$. Neglecting air resistance, the time it takes to reach its release point is about.

(a) $4 \, \text{s}$ (b) $1 \, \text{s}$ (c) $3 \, \text{s}$ (d) $2 \, \text{s}$

The equation of uniformly accelerated motion of the body thrown up:

$$0 = v _ {0} - g t$$

Where $t$ – the time ascent to the max height

$$v _ {0} = g t$$ $$t = \frac {v _ {0}}{g}$$ $$t = \frac {10 \, \text{m/s}}{9,8 \, \text{m/s}^2} \approx 1 \, \text{s}$$

Since the acceleration is constant, the time during which the body rises equal to the time of its descent.

Scilicet $\mathbf{T} = 2\mathbf{s}$

Answer the questions:

The time it takes to reach its release point is about (d) 2 s.

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