6. A woman pushes a 16 kg lawnmower at a steady speed. She exerts a 170 N force in a direction 33 below the horizontal. The acceleration of gravity is 9.8 m/². Find the magnitude of the vertical force this lawnmower exerts on the lawn. Answer in units of N.

7. A person is standing on a spring bathroom scale on the floor of an elevator which is moving up and slowing down at the rate of 2.98 m/s². The acceleration of gravity is 9.8 m/s² . If the person's mass is 87.9 kg, what does the scale read? answer in units of n.

4. A 0.41 kg object is at rest. A 3.21 N force to the right acts on the object during a time interval of 1.64 s.

a) What is the velocity of the object at the end of this time interval?

Answer in units of m/s

15. At the end of this interval, a constant force of 4.41 N to the left is applied for 2.60 s.

b) What is the velocity at the end of the 2.60 s?

Answer in units of m/s.17.

20. A ball is thrown horizontally from the top of a building 49.3 m high. The ball strikes the ground at a point 35.6 m from the base of the building. The acceleration of gravity is 9.8 m/s . Find the time the ball is in motion. Answer in units of s.

a. Find the initial velocity of the ball. Answer in units of m/s.

22. Find the x component of its velocity just be- fore it strikes the ground.

Answer in units of m/s².

23. Find the y component of its velocity just be- fore it strikes the ground.

Answer in units of m/s².

24.A firefighter of mass 44 kg slides down a vertical pole with an acceleration of 6 m/s² . The acceleration of gravity is 10 m/s² . What is the friction force that acts on him? Answer in units of N.

25.A boat moves through the water with two forces acting on it. One is a 2.3110³ N forward push by the motor, and the other is a 1.7010³ N resistive force due to the water.

What is the acceleration of the 1129.1 kg boat

a. If it starts from rest, how far will it move in 11.5 s?

Answer in units of m.

b. What will be its speed at the end of this time interval?

Answer in units of m/s.