What force is needed to accelerate a 4.2 kg mass with an acceleration of 9.3 m/s/s?

What best describes a sonar wave? transverse and electromagnetic transverse and mechanical longitudinal and electromagnetic longitudinal and mechanical

Which are examples of projectile motion? choose all that apply a. a soccer ball rolling across the ground in the northeast direction b. a car turning a corner, so it is heading south c. a javelin flying through the air d. a tennis ball lobbed over the net

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body