question archive What is the net force acting on a 4
What is the net force acting on a 4
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What is the net force acting on a 4.0 kg block with the initial velocity of 2.0 m/s if the final velocity is 4.5 m second is reached after 2.0 seconds of acceleration?
what is the mass of a truck that is travelling for velocity of 108 km/h in his momentum of 1.8×10^5 kg•m/s
What is momentum of a 4.5 kg remote control plane flying with a velocity of 24.0m/s
A 1200 kg car starting from rest accelerates at a constant rate of 2.0 m/s^2 determine the car is momentum after 12 seconds
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1) The acceleration is [(4.5 m/s) - (2 m/s)] / 2s = 1.25 m/s². Since the mass is 4 kg, then from Newton's 2nd Law of Motion. Fnet = ma = (4 kg)·(1.25 m/s) = 5 N
2) 108 km/h = 30 m/s. Since momentum is P = mv, then 180000 kg·m/s = m·(30 m/s) ==> m = 6000 kg
3) P = mv = (4.5 kg)·(24 m/s) = 108 kg·m/s
4) Final speed is (2 m/s²)·(12 s) = 24 m/s. Since the mass is 1200 kg. Then, momentum is P = m·v = (1200 kg)·(24 m/s) = 28,800 kg·m/s
