A car moving along a straight line at 20 meter per second undergoes an acceleration of 4 meter per second square. After 2 seconds its speed will be what

An ambulance emits a frequency of 450 hz from its siren. what frequency is heard by a man as the ambulance moves toward him? less than 450 hz more than 450 hz 450 hz 0 hz

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?