1. The speed of an object moving in a straight line increases from 10 m/s to 20 m/s in 2 s. What is the average acceleration? (a) 5 m/s2 in the direction of motion of the object (b) 5 m/s2 in the direction perpendicular to the motion of the object (c) 5 m/s2 in the direction opposite to the motion of the object d) 5 m/s2 30 in the direction of motion of the object 2. A puma can jump to a height of 3.7 m when its initial velocity is at an angle of 45 to the horizontal. The initial speed of the puma is. (a) 40m/s (b) 20 m/s (c) 12 m/s (d) 32 m/s 3. A 2.0 kg mass sits at rest on a plane inclined at 30 from the horizontal. The coefficient of static friction is 0.70. What is the frictional force on the mass? (a) 5.9 N (b) 6.9 N (c) 8.5 N (d) 9.8 N 4. A water skier with a mass of 65 kg is pulled behind a boat that is moving with a constant speed of 25 m/s. The tension in the horizontal rope is 1.2 x 10$ 1.2 x 103 N [S]. The magnitude of the force that the water exerts on the skier's ski. (a) 1000 N (b) 1400 N (c) 2500 N (d) 5200 N 5. In which of the following directions is the centripetal force acting on an object undergoing circular motion? (a) in a straight line away from the centre of the object's path (b) in a straight line away from the object at a 90 angle (c) toward the centre of the circular path (d) along the object's path