Practice for Mechanics Grade 9-10

During motion of an object is it possible to have zero speed but constant acceleration?. Yes. No.

Is it possible for an object to have to have constant speed but positive acceleration?. No. Yes.

If density of air increases will air friction increase or decrease?. Increase. Decrease.

What are the forces acting on an object falling down from greater height?. Weight, Air friction (drag) and Electrical force. Weight and Air friction (drag). Weight only. Air friction (drag) only.

A car increases its speed from 3 m/s to 7 m/s in 4seconds. Calculate its acceleration. 10 m/s^2. 100 m/s^2. 1 m/s^2. 0.1 m/s^2.

Acceleration of a car is 3 m/s^2. Car started from rest and reached final speed in 2 seconds. Calculate final speed. 600m. 60m. 6m. 0.6m.

Two cars start travelling from rest. Ratio of their acceleration is 2:3. If time taken by both are 5 seconds, then calculate ration of their final speed. 3:2. 9:4. 4:9. 2:3.

A cart moving with a speed of 4 m/s is suddenly completely stopped in 2 seconds. Calculate acceleration and give answer with correct sign. +2 m/s^2. -2 m/s^2. + 4 m/s^2. - 4 m/s^2.

When we drive car if we hold the accelerator at constant position will speed increase or not?. Speed remains same. Speed increases. Speed decreases.

If direction of motion of a car changes then will acceleration also change. Assume speed remains constant and object is moving on horizontal surface. Yes. No.