Physics Assignment (2 Qs only)

1. You are at the top of a 60 m high tower. You drop a stone with initial velocity v0; air drag is negligible (and take g = 10 m/s2). Calculate the final speed of the stone when it hits the ground if:

(i) v0 = 0 m/s

(ii) v0 = 6 m/s pointing upward.

(iii) v0 = 6 m/s pointing downward.

2. In the figure below (not in scale), the two vectors have magnitude |A| = 4 and |B| = 2.

(i) Calculate the components of vector A.

(ii) Calculate the components of vector B.

(iii) Calculate the components of vector 2A - 3B.

(iv) Calculate the magnitude of vector 2A - 3B.

(v) Calculate the angle between vectors A and B.

A

B

30°

y

x

20°