A ball is thrown upward at 4 feet per second starting 5 feet above the ground. How long does it take for the ball to return to the ground?

1.25 seconds

Step-by-step explanation:

.25

.25

.25

.25

+.25=1.25 seconds

i think it is c, not positive though

step-by-step explanation:

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.