A 3.0-kg projectile is fired with initial velocity components v_0x = 10 m/s and

Question

A 3.0-kg projectile is fired with initial velocity components v_0x = 10 m/s and v_0y = 20 m/s from a point on the earth's surface. Neglect any effects due to air resistance. a What is the kinetic energy of the projectile when it reaches the highest point in its trajectory? b How much work was done in firing the projectile? A 4-kg block is connected by means of a massless rope to a 2-kg block as shown in the figure. Complete the following statement: If the 4-kg block is to begin sliding, the coefficient of friction between the 4-kg block and the surface must be

Explanation / Answer

3)

a) at the highest point

the velocity is only horizontal

kinetic energy at the highest point = 0.50 * 3 * 10^2

kinetic energy at the highest point = 150 J

b)

for the work done

work done in firing the projectile = 0.5 * 3 * (10^2 + 20^2)

work done in firing the projectile = 750 J

the work done in firing the projectile is 750 J

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