Solving Kinematic Problems

It took a squirrel 0.50 s to run 5.0 m leftward to a nearby tree while maintaining constant acceleration. The squirrel was running 15 m/s leftward when it reached the tree. What was the squirrel's initial velocity?

• 2.5 m/s

• -2.5 m/s

• 5.0 m/s

• -5.0 m/s

A car is travelling to the right with the speed of 29 m/s when the driver slams on the accelerator to pass a truck. With a constant acceleration, the car passes the truck in 110 m and reaches a speed of 34 m/s. What was the acceleration of the car as it sped up?

• $315\ \frac{m}{s^2}$

• $1.4\ \frac{m}{s^2}$

• $2.6\ \frac{m}{s^2}$

• $14.5\ \frac{m}{s^2}$

A child blows a leaf from rest straight up in the air. The leaf has a constant upward acceleration of magnitude

 $1.0\ \frac{m}{s^2}$ . How much time does it take the leaf to displace 1.0 m upwards?

• 3.2 s

• 6.8 s

• 15.6 s

• 1.4 s

A dog walking to the right with a speed of 1.5 m/s sees a cat and speeds up with a constant rightward acceleration of magnitude

 $12\ \frac{m}{s^s}$ . What is the velocity of the dog after speeding up for a 3.0m?

• 8.6 m/s

• 74.25 m/s

• 2.25 m/s

• 1.5 m/s

A boat is drifting to the right with a speed of 5.0 m/s when the driver turns on the motor. The motor runs for 6.0s causing a constant leftward acceleration of magnitude

 $4.0\ \frac{m}{s^2}$ . What is the displacement of the boat over the 6.0s time interval?

• 42 m

• -42 m

• 30 m

• -30 m