A ball of mass 2.0 kg is thrown vertically upward front the top of a building. The ball’s velocity v is given as a function of time t by the equation v(t)=R-St, where R=5 m/s and s=10 m/s^2. The positive direction is upward. What is the ball’s acceleration at time t= 1 s A. -10 m/s ^2
B. -5 m/s ^2
C. 0
D. 5 m/s^2
E. 10 m/s^2

According to newton's second law, when the same force is applied to two objects of different masses, a the object with greater mass will experience a great acceleration, and the object with less mass will experience an even greater acceleration, b. the object with greater mass will experience a smaller acceleration, and the object with less mass will experience a greater acceleration, c. the object with greater mass will experience a greater acceleration, and the object with less mass will experience a smaller acceleration, d. the object with greater mass will experience a small acceleration, and the object with less mass will experience an even smaller acceleration.

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?

The mantle is made up of which structural zones?