An object is projected (e.g. thrown) straight upward. Neglecting Air resistance, it (select all which apply)...
Returns with the same initial speed
Has zero velocity at the top of the projection
has constant acceleration throughout
has constant velocity throughout
does none of the above.
Returns with the same initial speed Has... View the full answer
- Acceleration can not be considered constant as it is a vector quantity, so when the rock is moving upward it has acceleration (equal to the g= 9.8m/S^2) in the negative direction (-9.8 m/s^2)of the motion and when it is falling back, its acceleration is equal to the gravitational acceleration but positive ( as in the direction of its motion )
- Apr 02, 2018 at 9:51pm
- we can not consider it as a constant as, half the time it is -9.8 m/S^2 and half the time it is +9.8 m/S^2
- Apr 02, 2018 at 9:52pm