Which one describes how much matter an object contains , using si units?
a. 43 kg
b. 38 pounds
c. 65 m
d. 89 seconds

Can someone explain to me how to do this problem ?

What is a good example of instantaneous speed

Steelhead trout migrate up stream to spawn.occasionally they need to leap up small waterfalls to continue their journey. fortunately, steelhead are remarkable jumpers, capable of leaving the water at a speed of 8.0 m/s. a. what is the maximum height a steelhead trout can jump? b.leaving the water at 8.0 m/s, the trout lands on top of the water fall 1.8 m high. how long was it in the air?