Q1. One 2 kg pebble is moving left on frictionless ice at a speed of v = 10 m/s as shown in Fig 1. At t = O s, a constant force F is applied to the particle. After 2 s, the velocity of the pebble has become v2 as shown in Fig. 2. The figures show what you see when viewing it from the top. Determine the magnitude of the force F.

A particle of mass 0.01 kg is traveling at a speed of 15.5 m.s¹ at an angle of 1.8 radians from the i vector (toward j). A force of 0.02e-0.02t N is applied to the particle at an angle of 3.4 radians from i. Answer all questions to at least 3 significant figures. Enter your numerical answers in SI units but do not enter the units. Determine the j component of the initial velocity [m.s¹] Determine the force in the i direction at t=3.8s [N] What is the i component of velocity at t-3.8s? [m.s¹]

A happy kangaroo leaps vertically upward at a time t = 0. At time t = 0.50 s the kangaroo is at a height of 2.0 meters above the ground. What is the speed and direction of motion of the kangaroo at this time (at t = 0.50 s)? Neglect air friction. 4.9 m/s downward 1.55 m/s upward O none of these 2.45 m/s downward 4.9 m/s upward 2.45 m/s upward

A helicopter with a mass of 10,000 kg takes off straight up at t=0. The thrust of the engine is defined given as a function of time: FT= 95 0.18t- (kN). Where t is in units of seconds. How fast is it rising and what is its elevation at t=4s?