Urgent ! -
answer asap!

1. what is the mass of a car that weighs 140,000 n?

2. calculate dave's acceleration knowing that in a race he starts from rest and reaches a speed of 15.3m/s in 4.71 s.

3. determine the speed of the block of wood when a 12 g bullet hits a 2.3 kg block at a speed of 350 m/s.

4. a 22 kg astronaut in orbit pushes a 40kg astronaut. if the 22kg astronaut travels away at 10 m/s what speeds and direction will the 40 kg astronaut travel away at.