Can a body with uniform acceleration always move in straight line?

What is uniform acceleration?

A body moving with uniform acceleration attains velocity 25m/s after 5 seconds and 34 m/s after 8 second. Calculate the distance it covers in the 10th second.

A body moving with uniform acceleration goes 65 m in 5th second and 105 m in the 9th second. How far will it go in the 20th second?

A body moving with a uniform acceleration describes 12 m in third second of its motion and 20 m in the fifth second. Find the velocity after 10 seconds.

The initial velocity of a car is 3 m/sec. Its after 1 sec. velocity changed to 4 m/sec. If the car moves with uniform acceleration, what will be its velocity after 10 secs?

During n^(th) second of its motion a body covers a distance S_n with uniform acceleration 'a' and initial velocity 'u'. Show that (a= frac(2S_n - 2u)(2n-1))

The displacement equation of a particle moving along a straight line with uniform acceleration is x = v_0t + 1/2at^2 . Find the distance covered by the particle in the last second of its motion.

When there is acceleration in a body:

A man of mass 70 kg stands on a weighing scale in a lift which is moving (a) upwards with a uniform speed of 10 m s^1 (b) downwards with a uniform acceleration of 5 m s^2, upwards with a uniform acceleration of 5 m s-^1z. What would be the readings on the scale in each case? What would be the reading if the lift mechanism failed and it hurtled down freely under gravity?