Un proiettile viene sparato con una velocità di \( 250 \mathrm{~m} / \mathrm{s} \) contro una barriera. Nella barriera, il proiettile rallenta con un'accelerazione costante di \( -1,04 \cdot 10^{6} \mathrm{~m} / \mathrm{s}^{2} \) fino a fermarsi. Calcola lo spazio di frenata.

1. Приведите примеры изменения скорости тела. В результате чего произошло это изменение? 2. Что характеризует сила? 3. Что значит измерить силу? Что принято за единицу силы?

A red toy car moving east at a velocity of \( \mathbf{3 . 2} \mathbf{m s}^{\mathbf{- 1}} \) collides with a blue toy car of the same mass moving in the opposite direction. After the collision, the red toy car has a new velocity of \( \mathbf{1 . 1 3} \mathbf{m s}^{-\mathbf{1}} \) east. Calculate the velocities of the blue toy car before and after the collision. ASSUME that the collision was perfectly elastic and there are no external forces

\[ \text { PHY 2101. Duration: } 1 \text { hour. } \] \[ \text { Altempt ALL questions } \] Question one (a) (i) State the principle of superposition of waves. (ii) Distinguish between standing and stationary waves. (b) Define the following terms as applied to sound waves (i) Interference and beating. (ii) resonance and fundamental frequence.

A man sitting nearby a cave of mountain hears the clear echo of his whistle in 0.2 second. How far is he from mountain? (Take v=332m/s). (Ans: 41.5 m

01 Determina lo spazio percorso da una motocicletta che in 1 min passa da una velocità iniziale di \( 40 \mathrm{~km} / \mathrm{h} \) alla velocità di \( 120 \mathrm{~km} / \mathrm{h} \).