Four cars A, B,C, D of masses 1000kg, 650 kg, 500kg, 2100 kg are running at the same speed of 50 m/s. If all cars are hit from behind with the same force and they continue to move forward, the maximum acceleration will be produced in : 

Aball bearing at 220.0 °c is dropped into a cup containing 250.0 g of water at 20.0 °c. the water and ball bearing come to a temperature of 30.0 °c. what is the heat capacity of the ball bearing in j/°c? (hint: how are the algebraic signs of q related for the ball bearing and the water? )

What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest

Matter that emits no light at any wavelength is called