Our friend, Superman, standing at the base of a skyscraper, which is 875 feet tall, sees Lois Lane dangling precariously off the edge of the top of the building. If he leaps upward with acceleration of a(t)=12t^2+20 ft/sec^2, what is Superman's speed when he saves Lois? (hint 875=5^4+10*5^2). Upload

! & OD. Mass 2M and speed 3V O E. Mass 3M and speed V *. 60 QUESTION 2 OA. Mass 3M and speed 2V Which of the following bodies has the largest kinetic energy? OB. Mass M and speed 4V OC. All four of the above have the same kinetic energy OA. 4.85 km/h and 39.8⁰ OB. 3.11 km/h and 39.8⁰ OC.3.73 km/h and 39.8⁰ OD.7.80 km/h and 39.8⁰ OE. 6.20 km/h and 39.8⁰ Two skaters collide and embrace in a completely inelastic collision. Alfred, with mass 83.0 kg, is originally moving east with speed 6.20 kmh. Barbara, with mass 55.0 MacBook UESTION 1 tion Status: are stuck kg, is originally moving north with speed 7.80 km/h. Find the magnitude and direction (with respect to +x direction) of the velocity of the couple after collision when they

Which of these options have a larger kinetic energy?   1) more mass, same speed 2) less mass, same speed  3)same mass, greatest speed 4) same mass, smaller speed

The kinetic energy of a 1000.01-kg car is 6.201 × 105 J. How fast is the car moving?

On the roller-coaster shown, a car is moving 10 m/s toward the right at point 1. Assuming no friction, calculate the speed of the car at point 4. 3 40 m 26 m 15 m 29.37 m/s 22.71 m/s 20.89 m/s 26.17 m/s A. D. В. 25.07 m/s Е. С. 24.29 m/s F.

A mass of 16 kilograms is suspended from a spring with spring constant 7 Kg/sec^2. The damping constant is 2 Kg/sec and the spring is subject to an external force F(t)= 3cos(9t) Newtons. The motion of the mass eventually settles down to a periodic oscillation. What is the period (in sec) of this periodic oscillation? 2 9.

Hi! I need help with finding the cross product of 2 vectors with only an i and a j but no z/k, can you please help? everywhere ive looked for help always has a z/k component and i dont know how to figure that out

The energy needed to increase the speed of a certain car from 22 m/s to 44 m/s is 240 kJ. At what speed is the car is kinetic energy equal to 240 kJ? 

36 Which of the following objects has the smallest kinetic energy? An object of mass 3m and speed 2v An object of mass m and speed 4v An object of mass 2m and speed 3v An object of mass 4m and speed v

A car with a mass of 1.86 x 10^3 kg increases its speed from 63.0 km/h to 90.0 km/h. What is thechange in kinetic energy?