ECAT MCQs

At terminal velocity, net force is zero.
The object then moves with constant velocity.

Use s=½gt².
S=½×10×9 = 45 m.

Centripetal acceleration changes the direction of velocity.
It always points radially inward.

At maximum height, final vertical velocity is zero.
0=20-10t gives t=2 s.

Centripetal force is not a separate force type.
It may be supplied by tension, friction, gravity, or another force.

Use v²=u²-2gh with v=0.
0=400-20h, so h=20 m.

A particle in translational equilibrium has no acceleration.
It may be at rest or moving at constant velocity.

Newton's second law gives F=ma.
F=5×4 = 20 N.

In ideal free fall, air resistance is neglected.
All objects then have the same gravitational acceleration locally.

Average speed equals distance divided by time.
120/10 = 12 m/s.

Slope gives change in velocity per unit time.
That is acceleration.

Displacement is 14-2 = 12 m.
Average velocity is 12/4 = 3 m/s.