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- An object is dropped from the top of a cliff 600 meters high. Its height above the ground t seconds after it is dropped is 600−4.9t^2. Determine its speed 9 seconds after it is dropped.For the mass shown in Figure 3.1.3b, m = 10 kg, = 25°, v(0)=2 m/s, and μ =0.3. Determine whether the mass comes to rest if (a) f1 =100 N and (b) f1 = 50 N. If the mass comes to rest, compute the time at which it stops. mg sin o N (b) Motion mg cos o mg sin o m Motion mg cos oThe position of a 2.6 kg mass is given by x=(2t3−5t2) m, where t is in seconds. What is the net horizontal force on the mass at t=0s? What is the net horizontal force on the mass at t=1s?