Mammals account for about 1/10

of all vertebrates. Birds account for about 1/6,
Of all vertebrates. Together, what faction of vertebrates is made up of mammals and birds?

If the speed of a particle triples ,by what factor does its kinetic energy increase?

During a car accident, a 125kg driver is moving at 31m/s and in 1.5s is brought to rest by an inflating air bag. what is the magnitude of the change in momentum to the driver

Aplayer uses a hockey stick to push a puck at a constant velocity across the ice. the weight of the puck is 170 n. the coefficient of friction is 0.0600. with what force must the player push the puck so that his force just equals the frictional force? 28.3 n 0.999 n 0.102 n 0.0104 n