1)

A soccer player kicks a stationary ball giving it a speed of 20 m/s at an angle of 15 degrees with the horizontal. (a) What time is required for the ball to reach the highest point in its trajectory? (b) How high is the ball at this instant? (c) What is the velocity of the ball at the highest point in its trajectory? (d) What will its horizontal range be?Suppose, as shown in the figure, that the 70 kg block is pulled by a 400-N force at an angle of 30 degrees to the horizontal. The coefficient of kinetic friction is 0.50. Find the acceleration of the box. 400 N 30Three blocks with masses 6.0 kg, 9.0 kg, and 10 kg are connected as shown in the figure. The coefficient of kinetic friction between the table and the 10-kg block is 0.20. Find (a) the acceleration of the system and (b) the tension in the cord on the left and in the cord on the right. a 3 T1 T1 m 2=10 kg m :=9.0kg m 1=6.0 kg