2. A of 3 m/s sied, whose mass is 12 kg is moving along the horizontal with an o
ID: 1795386 • Letter: 2
Question
2. A of 3 m/s sied, whose mass is 12 kg is moving along the horizontal with an original velocity s passes over a rough patch in the snow of 0.8 m in length. If the force of cion between the ground and the sled is -14 Nt determine: (a) Keoi (b) work done by friction; (c) Vor of the sled. A block whose mass, m 25 kg, is initially at rest on the horizontal. if a 100 Nt force is applied to the mass parallel to the horizontal and displaces the mass a distance of 12 3. m determine: (a) the work done on the mass; (b) the final velocity.of the mas assuming no friction. Determine the height to which the rocket rises. Write in words Newton's three Laws of Motion. 4. A toy rocket of mass 0.459 kg is launched upward with a velocity of 18.5 m/s. A person standing on the roof of a 12 m high building throws a ball upward at 22 m/s Determine: (a) how high the ball goes with respect to the ground and (b) the ball's velocity at impact with the ground. (Hint: Use The Law of Conservation of Energy).Explanation / Answer
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3. Work Done on the mass W = Force * displacement
W =100* 12
W = 1200 Joules
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Use the kinematic equation V^2 = u^2+2as
Acceleration acquired by mass a = F/m
Acceleration a = 100/25 = 4m/s^2 so
V^2 =0^2 + (2* 4* 12)
V =final velocity = 9.79 m/s
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4. from the law of conservation of energy
PE = KE
0.5 mv^2 = mgh
Height H = v^2/2g
H = 18.5^2/(2* 9.81)
H = 17.44 m
5 NEWTONS LAw.
First law: every body has the tendency to be at rest or of uniform motion unless it is
Compelled by an external force.
Second law: the rate of change of momentum of a body is always directly proportional to net force acting it
Third law: “ to every action, there is an always equal and opposite reaction”
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