How do I find deceleration

Josh is designing a lab to separate a mixture of salt and water. He looks at all the ways to separate a mixture but decides that one way would work the best on this solution. What method should Josh use?

A vertical spring has a length of 0.25 m when a 0.175 kg mass hangs from it, and a length of 0.775 m when a 2.075 kg mass hangs from it. gA. What is the force constant of the spring, in newtons per meter? B.

A car drives on a circular track with a constant speed of 84 m/s. The track has a radius of 225 m. What is the centripetal acceleration of the car? What is the acceleration of the car measured in g? What speed would give the car an acceleration of 9.

If gravity between the Sun and the Earth suddenly vanished, Earth would continue moving A. in a curved path B. an outward spiral C. an inward spiral path D. in a straight-line

Which of the following is an example of convection? A. hot air rising and cooler air falling B. a hot oven warming the air around it C. the rays of the Sun warming the earth D. a hot object transferring heat to a cooler one P. S. this is science

Which of the following statements best describes the current state of understanding regarding the apparent acceleration of the expansion of the universe?

Should young people be allowed to do extreme sports? (give me two reasons why) 1. Opinion: 2. Reason why: 3. Reason why:

A light ray is incident on a reflecting surface. If the light ray makes a "35°" angle with respect to the normal to the surface, what is the exact angle (in degrees) made by the reflected ray relative to the normal?

Reimbursement means that a client is A. able to apply for healthcare insurance and refunded for a partial sum of the payment plan by the state. B.

Meg runs a 10km race in 45 minutes (0.75 hours). What was her speed in kilometers per hour? a. 22 km/hr b. 7.5 km/hr c. 4.5 km/hr d. 13 km/hr