$10.$ The acceleration due to gravity in Mars is $4$ m$/$s$2.$ If an astronaut on Mars were to toss a wrench upwards with a speed of $10$ m$/$s$,$ find a$)$ how long it would rise; b$)$ how high it would go$,$ c$)$its speed at t$=3$s; and its displacement at t$=3$s