If S=-5t + 5t-3, when will the velocity be 2? 2. If S=t5-10t, when will the acceleration be zero? 3. If S=t-t3, find the velocity when the acceleration be zero? 4. Two particles have positions at time t given by the equations S = 4t-t and S = t -2. Find their position when they have the same velocity. 5. Two particles have positions at time t given by the equations S = t-t and S = 6t-t Find their velocity when they have the same acceleration. 6. A baseball is thrown directly upward with an initial velocity of 64ft per second. How will it rise? 7. A cliff 128 ft high overhangs a lake. A man on the edge of the cliff throws a stone vertically upward with a velocity of 32ft per second. And what velocity does the stone strike the water? 8. A bomb is dropped (= from an airplane 6400ft high. Find when and at what velocity the bomb will strike the g 9. Find the initial velocity needed in order to shoot a projectile vertically upward a distance of 10000 feet. If S=-5t + 5t-3, when will the velocity be 2? 2. If S=t5-10t, when will the acceleration be zero? 3. If S=t-t3, find the velocity when the acceleration be zero? 4. Two particles have positions at time t given by the equations S = 4t-t and S = t -2. Find their position when they have the same velocity. 5. Two particles have positions at time t given by the equations S = t-t and S = 6t-t Find their velocity when they have the same acceleration. 6. A baseball is thrown directly upward with an initial velocity of 64ft per second. How will it rise? 7. A cliff 128 ft high overhangs a lake. A man on the edge of the cliff throws a stone vertically upward with a velocity of 32ft per second. And what velocity does the stone strike the water? 8. A bomb is dropped (= from an airplane 6400ft high. Find when and at what velocity the bomb will strike the g 9. Find the initial velocity needed in order to shoot a projectile vertically upward a distance of 10000 feet.