Author Question: A projectile is fired over a horizontal surface at an angle of elevation of 70. Neglecting air ... (Read 205 times)

bucstennis@aim.com · **on:** Jul 28, 2018

A projectile is fired over a horizontal surface at an angle of elevation of 70. Neglecting air resistance, what are possible angles in flight between the acceleration vector and the velocity vector?
a. 170 and 40
c. 90 and 15
b. 120 and 70
d. none of the above

Question 2

A 200-N block, on a 30 incline, is being held motionless by friction. The coefficient of static friction between the block and the plane is 0.60 . The force due to friction is:
a. 104 N.
c. 60 N.
b. 100 N.
d. 0 N.