A car advertisement claims that a certain car can accelerate from rest to 70 km/hr in 7 seconds (hint: convert to hours first!!) Find the car’s acceleration.

Abumper car with a mass of 250 kg is traveling at a speed of 4 m/s. this bumper car collides and sticks to a second bumper car with a mass of 250 kg, which is initially at rest. what is the final speed of these two bumper cars after the collision, assuming they remain stuck together?