5 Una pelota al ser soltada en una pendiente ad- quiere una aceleración cuya magnitud es de \( 6 \mathrm{~m} / \mathrm{s}^{2} \) en 1.2 segundos. Calcular: a) ¿Qué rapidez lleva en ese tiempo? b) ¿Qué distancia recorrió?

Exercise 3.6: A ball is thrown vertically upwards with a velocity of \( 10 \mathrm{~m} / \mathrm{s} \) from the balcony of a tall building. The balcony is 15 m above the ground and gravitational acceleration is \( 10 \mathrm{~m} / \mathrm{s}^{2} \). Find (a) the time required for the ball to hit the ground, and (b) the velocity with which it hits the ground.

31 IMMAGINI Su un rettilineo unautomobile accelera in modo uniforme per 20 s fino a una velocità di modulo \( v_{0} \), che mantiene per i successivi 40 s . In figura è illustrato il corrispondente grafico velo- cità-tempo. Sapendo che lautomobile percorre in totale \( 2,5 \mathrm{~km} \), ricava \( v_{0} \). Poi riporta sul grafico in figura i valori delle velocità in corrispondenza delle tacche che vedi sull'asse verticale.

(b) A mass of 7.5 kg has weight of 30 N on a certain planet. Calculate the acceleration due to gravity on this planet.

If the two forces \( \overrightarrow{F_{1}}=6 \hat{\imath}+4 \hat{\jmath}, \overrightarrow{F_{2}}=3 \hat{\imath}+2 \hat{\jmath} \quad \) acts at the two points \( A(1,2), B \) respectively, and the resultant of the two forces act on \( C(2,1) \in \overleftrightarrow{A B} \) find \( B \)

(c) A small force of 100 N is applied on a small piston of area \( 0.25 \mathrm{~m}^{2} \) produces a bigger force on a larger piston of \( 1 \mathrm{Om}^{2} \). Calculate \( \mathrm{F}_{2} \). (d) Explain why water storage tanks in houses are erected as high as possible. (2mks) (a) Differentiate between cohesive forces and adhesive forces. (a) (2mks)